Bunngie cannot give you a code as it was GameStop and Activision who did the promotion.
You would have to contact GameStop through their customer support, but they will only give you the code you were meant to get.
Considering you have that code they will tell you that you need contact the manufacturers for a working code.
Basically it is a cat and mouse hunt.
I know this because I'm in the same position.
Never got my code, emailed GameStop who eventually gave me my code.
I entered the code on my Xbox and it says it was already used.
Messages GameStop back and that's when they told me they don't have codes to give away and I'd need to contact the manufacture which in this case is Activision.
Activision have no support line for destiny.
So I gave up and advise you do the same.
English
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Yeah, I'm actually at the same step you are. Haha. I have faith that the developers of the game can procure a shader code. I don't feel that it's beyond the scope of their abilities.
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Well if you get anywhere let me know! I got tired of the run around.