Stop screwing around with this guy. Send him a registered letter, that he'll have to sign for, telling your story and asking for a refund for the amount paid. Include the copy of the receipt and advise him that if you do not receive a suitable reply in 30 days to your supplied mailing address, that you will be forwarding a copy of the letter to the local sheriff and BBB, describing how you have been defrauded and asking for legal action therefore. If you know a lawyer, have him write a letter- he'll know how to phrase it- stating that you are beginning legal action to recover the amount you were defrauded for, PLUS unspecified damages. Worth a shot.