1156783443 i was playing zombies on xbox live and
some hackers kicked me from the games and negitived my xp so i cant play online cause im negitive lvl 1
Read this about the Call of Duty problem -
Unfortunately there's not much you can do. Next time you find yourself in a modded lobby, leave immediately.
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same thing happened to me. if you find a fix let me know. I actually enjoyed the game before that happened