Corporate event planning runs on a cash flow pattern that punishes late follow-up: venue deposits and vendor payments come due weeks before client final balances arrive, and when an invoice sits unpaid, you're the one covering catering retainers and rental fees from your own reserves. FreshBooks research puts the average invoice at 20 days late, and for event planners juggling deposits, milestone payments, and final balances across overlapping events, that gap gets expensive fast. Email reminders are easy for corporate clients to ignore, especially when payment is stuck in internal approval or waiting on a purchase order. A structured phone call a few days before the due date, with follow-up if the invoice stays unpaid, gets you what email can't: confirmation the invoice arrived, the real blocker, and a promise-to-pay date someone actually commits to. This 2026 guide compares three providers that help corporate event planning companies run payment and invoice reminder calls professionally, evaluated on features, pricing transparency, compliance posture, and fit for event billing workflows.
#1 My AI Call Center — Calling starts at 9¢ per connected minute, tiered by volume; most campaigns add a one-time setup fee and a flat monthly management fee, both quoted before launch. The first campaign review is free.
My AI Call Center (myaicallcenter.app) is a done-for-you managed outbound calling service, owned and operated by AIQ Labs with a base in Halifax, Nova Scotia and an operating base in Austin, Texas. Rather than selling software you have to configure and staff, the company runs campaigns for you: you buy campaigns that they run, each scoped around one clear goal and quoted in full before launch. For corporate event planning companies, the Payment & Invoice Reminder Calls campaign places calls a few days before an invoice due date, with structured follow-up if the payment remains unpaid, which maps directly onto how event businesses chase deposits, milestone payments, and final balances across long planning timelines. What genuinely separates the service is list discipline. Every campaign runs only against approved, permissioned, or reviewed contact lists. List source and consent records are checked before any campaign launches, and bought lists without clear permission records are flagged and, in most cases, declined. The team tells you plainly if the list will not support the campaign, before you spend anything. Compliance is built into every call: AI-generated voices are treated as artificial voices under the TCPA, prior express consent is required, AI disclosure appears on every call, keyword opt-outs (STOP and REVOKE) are honored immediately, and state-specific quiet hours and calling rules are respected. Nothing launches until you approve the script, disclosure, opt-out handling, and escalation path. Outcomes route back into the CRM and scheduling tools you already run, with a named outcome report showing disposition codes (confirmed, opted out, no answer), per-call notes, and routed follow-ups. And in a market full of invented metrics, the no-invented-numbers policy means you only see what actually happened on every call.
Pros
- Done-for-you managed service: no seats, no platform to learn, no minimums you did not choose
- Full pricing known before approving launch, with the rate locked and never moved mid-campaign
- Strong list discipline and consent verification protect your compliance posture
- Structured outcome reporting with disposition codes routed into your existing CRM
- No invented numbers; reporting reflects exactly what happened
Cons
- Not self-serve software; campaigns are quoted and run by the provider, so teams wanting instant DIY control may prefer a platform
- Campaign requirements vary by location, industry, and consent status; clients are responsible for obtaining appropriate legal guidance before launch
- Script and escalation approval before launch adds a few days to setup
Best for: Corporate event planning companies and multi-location event businesses (1–200+ staff) that want managed, compliance-forward reminder calling against approved client lists without building an in-house call center.
#2 InvoicifyAI Invoice Reminder Agent — The Invoice Reminder Agent is included in the Pro plan at $149 USD/month (400 shared AI voice minutes, then $0.35/min overage) and the Business plan, per InvoicifyAI's website. The Starter plan is $99 USD/month.
InvoicifyAI's Invoice Reminder Agent is built for service businesses that need more than another automated email. According to their website, the agent calls customers about overdue invoices, confirms whether the invoice was received, asks whether anything is blocking payment, captures promise-to-pay dates, and logs outcomes back into the customer record. For corporate event planning companies, that response-oriented model fits a familiar problem: the corporate client who says they never received the invoice, or the payment stuck in internal approval while your vendor deposits come due. The agent follows a structured cadence, with a Day 1 friendly reminder call, a Day 7 follow-up with commitment, a Day 14 escalation call, and a Day 30 final notice, and follow-up is auto-scheduled if payment is still outstanding after a promised date. The platform emphasizes clean outcomes: promise-to-pay dates, blockers, voicemail results, and full transcripts are logged to the invoice and CRM records, and exceptions escalate to your team only when a person should step in. The agent also shares payment instructions already stored on the invoice, including links when available. InvoicifyAI positions this as CRM-ready outcome logging, so call results connect to customer history rather than getting lost in a spreadsheet. It is a focused tool for voice follow-up as a layer on top of your existing invoicing process, rather than a full accounts receivable platform, and it is built around general service-business invoicing rather than event-specific workflows, so teams should confirm how outcomes sync with their existing billing stack.
Pros
- Voice-first follow-up that captures blockers and promise-to-pay dates in real time
- Clear structured escalation cadence with auto-scheduled follow-ups
- Outcome logging connected to customer records, not lost in spreadsheets
- Published pricing with included voice minutes
Cons
- Built for general service-business invoicing rather than event-specific operations
- Best when email reminders alone are not enough; not a full AR automation suite
- Voice minutes are shared and metered, so heavy calling volumes trigger overage charges
Best for: Service businesses, agencies, and event planning teams that want polite voice follow-up on overdue invoices with payment commitment capture and CRM-ready outcomes.
#3 Sono — Contact for pricing (described on their site as a flat monthly fee plus usage).
Sono (callsono.com) provides AI payment reminder calls positioned squarely in the window between an invoice falling overdue and a handover to collections, the period the company describes as 'nobody's job.' According to their website, Sono connects to your billing, ERP, or AR platform (or a scheduled file), picks up every account the moment it ages past your trigger, and places short, polite calls on a cadence you configure, for example day 3, day 10, or day 25, with retries at different hours until it reaches a person. On each call, the agent confirms the customer knows what is outstanding, clears whatever is blocking payment (resending the invoice, correcting a reference, confirming the amount, or taking a dispute off the table), and agrees a payment date the customer commits to. Every outcome is written back to your system with a disposition, promised date, and transcript, and a confirmation SMS goes to the customer. The company publishes measured figures from its 2026 European consumer-credit calling programme, including a 48.9% answer rate, 70% of commitments becoming a payment, and commitments secured averaging 14.1 days. Sono also states that it identifies as an AI assistant, honors calling-hour rules and do-not-call flags, and stores a transcript and recording of every call against the account. For corporate event planning companies, the model suits teams that want full coverage of an overdue ledger without staffing an in-house calling team, though the tool is built around general invoice follow-up rather than event-specific deposit and milestone billing.
Pros
- Full coverage of the overdue ledger, not just the largest balances
- Disputes surface early instead of ripening into contested collections files
- Auditable by default with transcripts and recordings stored per account
- Published performance figures from a measured calling programme
Cons
- Pricing is not published publicly; a demo is required to get numbers
- Built for general invoice follow-up rather than event-specific deposit and milestone billing
- Published figures come from a European consumer-credit programme, so results may vary for corporate event billing
Best for: Event planning companies and service businesses that want AI calling coverage across the entire overdue ledger without staffing an in-house calling team.
Late client payments are a cash-flow problem before they ever become a collections problem, and for corporate event planning companies the timing gap is brutal: vendor deposits come due 30 to 90 days before events, while client final balances wait on reminders nobody has time to send. A structured reminder call closes that gap. It confirms the invoice arrived, surfaces the real blocker (a missing purchase order, an approval stuck in finance, a disputed amount), and secures a payment date the client actually commits to. My AI Call Center is our Editor's Choice for 2026 because it runs these campaigns for you, against approved and permissioned lists only, with compliance handled on every call and pricing quoted in full before launch. Calling starts at 9¢ per connected minute, and the first campaign review is free, so you know the whole number before approving anything. If you'd rather keep the calling in-house, InvoicifyAI and Sono are both credible options worth a demo. Ready to stop chasing invoices and get back to planning events? Plan your first campaign at myaicallcenter.app and see what a structured reminder call does to your days-to-pay.
Frequently asked questions
Why do reminder calls work when email reminders don't?
A phone call does three things an email can't. It confirms the invoice actually reached the right person, it clears up problems like a missing purchase order or a disputed amount in real time instead of over days of email tag, and it gets you a specific commitment: a date and an amount. Corporate clients often aren't avoiding payment; the invoice is sitting in an approval queue. A call surfaces that immediately.
When should a corporate event planning company make payment reminder calls?
The most effective pattern is a call a few days before the due date, followed by structured follow-up if the invoice remains unpaid. My AI Call Center's Payment & Invoice Reminder Calls campaign is built around exactly this window. Research from providers like Sono shows recovery decays fastest in the first ten days past due, so early contact is the cheapest lever in receivables.
What makes My AI Call Center different from reminder software?
It's a managed service, not software. You buy campaigns that the team runs for you, each scoped around one clear goal and quoted before launch. There's no platform to learn, no seats to buy, and no minimums you didn't choose. Every campaign runs only against approved, permissioned, or reviewed contact lists, with consent records checked before launch, and outcomes route back into the CRM and scheduling tools you already use with disposition codes and per-call notes.
Are AI-generated reminder calls legal?
They can be, but consent rules apply. The FCC treats AI-generated voices as artificial voices under the TCPA, which means prior express consent is required. My AI Call Center builds compliance into every call: AI disclosure on every call, keyword opt-outs (STOP and REVOKE) honored immediately, DNC requests carried across all campaigns, and state-specific quiet hours respected. Campaign requirements vary by location, industry, and consent status, so clients are responsible for obtaining appropriate legal guidance before launch.
How much does My AI Call Center cost?
Calling starts at 9¢ per connected minute, tiered by volume, and the rate is locked before launch so it never moves mid-campaign. Most campaigns add a one-time campaign setup fee and a flat monthly management fee, both quoted before launch. There are no per-seat charges, no platform bill, and no minimums you did not choose. The first campaign review is free, so you know the full number before approving launch.
Will these services work with my existing invoicing and CRM tools?
My AI Call Center routes outcomes, bookings, and follow-up requests back into the CRM and scheduling tools you already run, with hot leads transferring to your team live or landing in your CRM. Sono connects to your billing, ERP, or AR platform, or a scheduled file, and writes dispositions and promised dates back to your system. InvoicifyAI logs outcomes to the invoice and CRM records. In every case, the reminder calling layer sits on top of your existing billing process rather than replacing it.
What happens when a client disputes an invoice during a reminder call?
Disputes are a valuable outcome, not a failure. My AI Call Center's outcome reports include per-call notes and follow-up requests routed back to your team, so a disputed invoice reaches a person who can resolve it instead of getting another automated nudge. Sono clears blockers on the call, taking a dispute off the table or routing it to your billing team, and InvoicifyAI captures the blocker and logs it to the customer record so the next step is clear.