You got scammed. If the transaction is within eBay's money back guarantee 30 day after delivery window, unless you can drag the buyer to say something in the dispute that proves he's trying to scam you, which they are under no obligation to even communicate with you, eBay will allow the 'buyer' to return the 'item they claim they received' for a 100% refund and you pay the shipping both ways. It's too easy for ANYONE to file a fraudulent return under any false pretense they can imagine. That's the reality of selling high risk items on eBay.