If your rank and stats have become corrupted, the Call of Duty servers will restore them using the most recently stored backup. This means that your rank and stats may not be exactly where they were before the reset occurred. Why ranks and stats get reset
The known reasons for why this could happen include:
Bans – If you have violated the Call of Duty: Black Ops II Security & Enforcement Policy, you may be subject to a temporary or permanent ban from the game, which can include having your rank and stats reset. When this happens, your game data will not be restored.
Data corruption – There are a variety of reasons for data corruption. If you feel your rank and stats were reset as a result of data corruption, please follow the instructions below.
If you have had your rank and stats unexpectedly reset in Black Ops II and need additional help, you will get the quickest response by reaching out to us at ActivisionAssist
on Facebook, or @ATVIAssist