According to the rules, all wins must be activated on the winner's account so if you receive a different game than the one that was stated in the giveaway, or if you can't activate the gift and you mark it as "received" you risk a suspension.
So you have to mark it as "not received" as soon as you can. Please post in the giveaway to notify the giveaway creator.

The giveaway creator can request the deletion of the giveaway, but he needs your agreement. If it's fine for you, please post that you agree on the giveaway page.

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