just ship one damn card that he paid for with btc. else you're gonna get marked as a scammer.
I gave him my terms and threats just as he did to me constantly, I'm not going to be pushed around by him any longer and let him damage my rep.
Its already clear he was the one trying to scam me for two cards.
IF HE SENT you money already, either REFUND HIM, or send him the damn card.
or else you're TAKING his money and scamming him.