Unfortunately, I don't think they can or will change the stats of a single person because of a modded lobby. It could be possible that they detect all players who connected to the lobby and reverse the damage it did, but I doubt it, especially considering their support has shifted towards Black Ops 2 now.
Good luck though!
I already looked it up. (on the activision website)
It is not possible to find a sollution for this problem.
They will not reset the stats or reverse my account in time.
I should play until prestige 20 to receive a token which reset my stats.
Too bad I'm only prestige 1 at the moment. Maybe a good idea to reset my game now.
Thanks for your comments everyone.