I had them pull money from my account when a buyer said what I sold him didn't work. It was an SR ecu that was pulled a few weeks before from a perfect car. I know he plugged it in and it didn't solve his problem so rather than resell it or ask for a refund he starts a dispute and won without any work. I called Paypal and they said they would always side with the buyer since they could cancel the charge with their bank or credit card. I actually got the computer back, verified it worked fine and resold it, that buyer said it worked fine and I'm sure is still using it. It pissed me off but nothing like what you're dealing with. I'd be doing the same thing if that's what I got back from the customer.