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Same happened to me when I won King of Fighters XIII. The guy tried to give me more keys for different games that were all duplicates also.

Did you contact the giveaway creator and tell him about it? If so, then ya, all you can do is wait. But maybe he doesn't know, or maybe he grabbed the wrong key.

If this was a honest mistake I think you can refuse the gift, and support to be contacted by the creator, they can delete the giveaway.

Sometimes things happen. I would rather contact giveaway creator first and see what is wrong before jumping to any conclusions or assumptions. But that is just me, you are free to do as you wish.

This happened to me a few times. I've contacted the g/a creators about it and two of them have replaced it with a working key/gift.

Mistakes happen.

Alien Rage was....Region locked-its game from CDA