eBay, new scam

I sold a Banksy print on eBay - minutes before the auction ended a friend offered to buy said print . I contact winning bid( who already paid via pay pal ) I am sorry but print had been sold. I foolishly arranged a bank transfer instead of PayPal.

The winner then reported me for not sending the print - long story short I had to pay him back again. Even when I produced paper work from my bank tracking the payment to his bank account.

eBay will alway back the buyer.
You have their address and name. Make a claim through MCOL to get your money back.