Some trouble with Dead Island. Help me please!!!

Hello, 2 days ago i won Dead Island key on steamgifts from contributor. Here is the giveaway: http://www.steamgifts.com/giveaway/jpJB9/dead- island . I Tryed to activate it on steam and it says that this game isnt available for purchase in my contry. I looked at steam store and there wasnt any problems to by it. I contacted with steam support and i got the answer :

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Hello,
Thank you for contacting Steam Support.
We require a digital photo or scan of the receipt, invoice, or bill of sale for your recent purchase (we accept receipts issued within the last 90 days).
We do not accept receipts from auction sites or in cases in which the game has been resold by another individual.
Please include a digital photo or scan of your purchase receipt in .jpg format with your reply.
Please also provide an image of the original packaging, the original CD, and the CD Key. "

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I wroted to steamgifts support and im waiting for some help. I realy hope steamgifts admins will do something couse its my ferst realy big win and i very want to play this game with friends. Id like to hear your advices what i have to do next or maby some your stories. Thank you!