I tried to login to play and it says i have been banned by punkbuster and i do not understand why. I checked everywhere and it says ive been using multihack, but i have not used it. I have been playing for almost 2 years without any problems. Please advise me how to correct this issue so i can start playing. Ive spoken to other players and they have told me that thier accounts have been duplicated and they ban the account. So i wonder is that what is happening? 

https://bf4db.com/forum/thread/admin-request-how-to-appeal-your-ban-56

Read this and create an appeal according to the guidelines.