How Do You Get Proof of a Bad Check?

This one's a little crazy, and it would only work in certain cases. But let's say that there's somebody who wants to start up a new beauty brand. They used to work at a big beauty brand for p and g or something. And they've got a little bit of investment money, and turns out a little flaky. So what you do is say, ok, you're tired of me hounding you for money. Let's have a payment plan.