My mw3 accounts has been hacked. How can i fix this? I have been reset and my weapon classes are colorful words such as; "deranked" "using" "phantom" "by enstone" "enstoneworld.com".

I have a ps3 console. I do not hack while playing. I don't even know how to. I do not wanna play on a corrupted game and get banned. I don't know how to fix it. I have tried and can not. I worked very hard for all my stats and ranks. Being deranked and losing my classes has made me furious. I simply want it fixed.