Jormungand

I'm not sure if this complaint should be in this thread exactly, but here goes. So I purchased Halo 4 (normal edition) and in a few weeks completed the two specializations I had unlocked (wetwork and operator), reaching level 70. Now...I am stuck at level 70. I cannot get more EXP until I choose another specialization, but I don't have the option because they are not listed. I don't have a code, either. I can't even return to the Spartan specialization. Needless to say I am more than a bit disheartened. Are there any ways for me to continue leveling up? Any advice would be appreciated. Cheers.