I'm in the same boat. when i went to redeem my code it said "already redeemed." I called xbox live support and the guy told me that some other profile had redeemed the code. He said it showed the gamer tag of the profile that redeemed it, but it wasn't one that was on my xbox. So whose could it be? So basically I got jacked? He told me my "best bet" was to hit up these forums and I'm no good at that either. Nothing new at Halo Waypoint. So random and frustrating.