BANNED from nearly all COD4 Servers

Im banned from nearly all COD4 servers...is there any way to get unbanned? Thanks

Buy another COD4 at the retail store.

change your cd key but it will cost money. Still not as much as buying a new cod 4.

so when you get banned its you cd code not your ip ? lol beceause my brother made a code hack program going to use it for once xD NOT