This isn't an answer to the direct question, but I've found AWS to be very understanding on issues of accidental overuse. If it's clear from your history that i

This isn't an answer to the direct question, but I've found AWS to be very understanding on issues of accidental overuse. If it's clear from your history that it was a one-off occurrence, considering giving them a call and seeing if they will refund/forgive some portion of it. It never hurts to ask.