We are sorry but we will not be able to activate your game code. Ebay is not one of our partners and in order for you to receive a code you would have had to buy an eligible AMD product.
Our terms state “Additionally, Applications are for personal use only (i.e. no commercial use including but not limited to use in an internet café environment). Participants may not resell Key Codes and so doing may void the Key Codes, the Participant’s AMD Unique IDs and/or the Participant's (or third party's) ability to download the Applications or use the Key Codes.”
This guy is a trusted reseller... what a terrible support !