I just got scammed 5 Gi from u there!!! Please refund or send btc!
He just say it's not him so why do you even ask for a refund ? O_o
If you have any proof it's him, post it and he will receive negative trust. But if you have no proof, don't waste your time posting. And in both case : SFYL.
Sorry for your loss too. but you could have avoided this by using an escrow or checking up with me here or asking for a signed message.