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Well first of all go and buy xbox live, has to be from a shop. take your xbox live card home and get the code and right it down.(DO NOT USE IT YET).
Then you take your card back to the shop you bought it from with the receipt, tell them that the code will not work and they will give you a knew card you can go home and use both codes, this works, well it does in the shop near were i live. (probably because there was a retard behind the counter)