(adsbygoogle = window.adsbygoogle || []).push({}); Ok my friend told me this and when i got ban i did it and it works.
-when your banned delete the mw3 patch in game data utility.
-get on the game re-download the path and go to play online it should take you to a party then pop up your still banned.
-when you get unanned you will still have your classes/camos/gun ranks/killstreaks.

Hope i helped!