When a script mistakingly provisioned a ridiculous amount of read/write capacity on hundreds of DynamoDB tables, we were presented with a bill in the thousands of dollars. We got reimbursed after talking with our account manager for 15 minutes.
Maybe my experience is the exception, but my account manager has always been extremely helpful at resolving whatever issues we had.
We had one with barely $7,000 of spending per month, but it might be because I already had my foot in the door with a previous account that brought them about $40,000/month.
Maybe my experience is the exception, but my account manager has always been extremely helpful at resolving whatever issues we had.