One guy has bought some vouchers from me. He has paid through paypal. Basically he paid only after redeemed those vouchers. But his adwords accounts got banned because he has opened the accounts from the same IP it seems. So he come and says he couldnt able to use the vouchers and asked me the refund. It is his mistake that he has opened accounts in the same IP. I told him, he has paid only after redeemed all the vouchers. But he has filed a dipute in paypal says "Unauthorized claim" I've provided all the details with paypal including the screenshots of our skype chat and also screenshots. But paypal has decided in favour of him and refunded him the money and closed the case. What shall I do now? Any idea?