Sorry to hear that you had a bad experience. That's definitely not the culture that I'm experiencing every day or that we hold ourselves to. Our goal is to deliver a ton of value to customers. If we are not delivering value then it would not be in line with how we operate to want to charge you for that.
Out of curiosity, did you try contacting AWS support? Almost all customers I speak to love our support and the fact they can speak to an actual human. Of course I can't speak to the actual case as I'm just providing my personal opinion here, but I would not be surprised if support could fix this for you quickly and zero out any small balances that you accrued because you weren't able to access/use your account.