This happened years ago, I went into an Xbox Live zombies match and someone corrupted my profile so it's stuck at prestige 10 level 1. It corrupted my entire profile so that my online progress never saves. Whenever I play online and then go back to the main menu or restart the game, a popup comes up saying my profile is corrupted and will be reverted to its last backup, but it reverts to a saved version that is corrupt. I would love to get this fixed and so far haven't found a way. PLEASE HELP!!!