We accidentally created an infinite loop with our crm and an api on aws. We at first didn't realize what was happening, then couldn't figure out how to stop it

We accidentally created an infinite loop with our crm and an api on aws. We at first didn't realize what was happening, then couldn't figure out how to stop it. The bill ended up being 10x what I had budgeted. I talked to aws and they graciously refunded me a 1/3 of the bill. So it helped, but still wiped out the remaining runway I had.