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AI voice agent for overdue invoice reminder calls: get paid without chasing every client

InfiVoice ยท 2026-11-14

An AI voice agent for overdue invoices calls your client the day a payment goes past due, at the time you choose, and reminds them of the amount and the due date. InfiVoice builds it with a visual flow builder, supports 30+ languages, and has a free plan with 100 credits.

Why overdue invoices go unpaid

An overdue invoice email gets buried under everything else in the inbox. Calling every client takes time your team doesn't have, so the reminder either goes out late or never goes out. Every week of delay is cash you don't collect.

How the reminder call works

You choose when to call, for example the day after the due date. The agent greets the client, names your business, and explains there's an open invoice. It answers basic questions about the amount, the due date, or the invoice number, using the information you load into the knowledge base. If the client wants to dispute a charge or talk about a payment plan, the flow flags the call so someone on your team can follow up.

What it logs and where it sends it

Each call records the outcome: says they already paid, asks for more time, disputes the invoice, didn't answer, or asked not to receive more calls. That result goes to a Google Sheets spreadsheet or to your system through a webhook, along with the date and invoice number. You see what is still open without checking each case by hand.

Outbound calls: mind the tone and the law

This is an outbound call, so check the automated calling rules that apply in your country and in the states you call. Keep a firm but polite tone, with no threats or pressure. Honor any request to stop calls right away.

How much it costs

InfiVoice has a Free plan with 100 credits and a Pro plan at $79 per month with 250 credits. One credit equals 60 seconds of call time, so a short reminder uses few credits. You can try it with your first invoices before you pay.

Getting started

Create an outbound agent, write the script with the amount, the due date, and the question of whether they already paid, load your billing details into the knowledge base, connect a Google Sheets spreadsheet, and assign your number. Make a test call to your own phone before you call any clients.

Frequently asked questions

Can the agent collect the payment over the phone?

No. The agent reminds the client about the invoice, answers questions with the information you load, and logs the result. If the client wants to pay or negotiate, the flow hands the call to someone on your team.

When should it call?

You choose the days and hours, for example the day after the due date and again a week later.

Which languages does it support?

InfiVoice supports more than 30 languages, so the agent speaks with each client in their language.

How much does it cost?

Free includes 100 credits. Pro costs $79 per month with 250 credits; 1 credit is 60 seconds of call time.

Where do I see the results?

In Google Sheets or in your system, through a webhook.

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