If for some reason your stats or rank information becomes corrupted, the Call of Duty servers will restore them using a previously stored backup. This means that your rank or stats may not be exactly where you were before the reset occurred. Activision
Customer Support will not be able to restore your rank or stats beyond what has already been restored by the automated process. We apologize for the inconvenience.
Xbox Ambassador | Xbox Forum Moderator | Xbox MVP
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A handful of players have faced this problem. If you want to retrieve your prestige/Stats you should direct your problems to COD forums ActiVison/TreyArch. Xbox Support team cannot help you with this problem as mentioned here