I recently bought AC Brotherhood and registered an account at Ubisoft.com but when I login and try to type the cd key it says "Key already used"!What to do?


I recently bought AC Brotherhood and registered an account at Ubisoft.com but when I login and try to type the cd key it says "Key already used"!What to do?
P.S. I didnt buy it from a friend.I bought the game from a shop

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