I bought destiny the collection at gamestop brand new still in the wrapper and when I got home I went and redeemed the iron gjallarhorn which worked then I tried to redeem my collection code and said the code was invalid and I went back to gamestop and the guy there said it was a bad code and to go to bungie for help but I don't know where to go, A little help?
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If that does not work you could contact Microsoft, or go back and challenge GameStop for selling a defective product.
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Sorry for not being much of a help, but you should post this on the Help section of the forums, someone will hopefully help you there and fill you in with what you should do. Have a nice day.