I bought myself a copy of Destiny for Christmas, and it looks like the DLC code doesn't work. In fact, it says it is already used.
I'm not sure how something like that could happen, it's not like I have ninjas living with me (I checked) I also tried redeeming it through the mobile app, hoping it was a server thing, and got the same results.
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Go back to the place where you bought it from and ask for another copy if not call the cops