Hi, I bought AMD AX-7770 (Far Cry 3 and Blood Dragon) in 2013, and I redeem it (like ABCDE1234) in 2013/09/26. Three days ago, I trade this code with another player,and it show "Invalid promo code. If you have any issue using your promo code, please contact our customer support". I sent email to AMD customer support, but they didn't respond to me. I didn't use this code before. Can anyone help me?