Interesting thing about one of the guys on your key... (UK guy) He is logged on 12 different CoD4 guids (8 of those keys are banned for other violations).. People I've seen on that many keys usually belong to some type of cheat group.. The cheater on your key is from the U.S.
It's possible someone stolen your key with a Trojan or a bad ingame mod that stolen your registry key.. I doubt a valid cdkey generator works for this game, it's like 1 in a million to get one to work. nm 12 diff keys..
So.. either you gave him your key or he stolen it some how, The key was logged with a cheat. With that being said.. keys busted with hacks do not get unbanned, Your only option at this point, is to buy a new game and format your harddrive before you reinstall the game.. that is if you can't figure out how it was stolen.. Hell, who knows if you downloaded an aimbot and the cheat had a cdkey stealer.. we have no way of knowing.
Better luck next time is the only thing to be said here...
IP's on your guid are from
UK, US, Netherlands