Call of Duty 4 account hacked

Hello OP.

You were not hacked, this happens when you play in a modded lobby.

The only solution is to make a new account.

Having problems with CoD on LIVE.

How I make a new account on Xbox?

Make sure no accounts are signed in on your console.
Press the xbox guide button and select profiles> create new profile.
When you create it remember to use a new wlid for it as 2 accounts can not share the same wlid.

(But you will need to purchase Gold for the account if you want to use it for online MP functions.).

And if you have a minute have a read through the post in the link OP, there is a guide on what to do if you find yourself in a modded lobby.
If you follow the steps it will prevent you from losing your stats again on a new account.

So basically I have to toss away my old live account because of some @@@ on xbox live?

Unfortunately its the only fix to play this specific game normally again.
You can play it if you are invited to games though, but you will not be able to earn XP and rank up due to the modded lobby wrecking your stats.

If it was me I would just keep using the old profile and play when I can get invites off friends, I would not want to make a new account and pay for gold just so I could play one game again.

This is down to the developers/publishers OP, MS ban these reprobates who mod but as long as the game is not patched/fixed by the devs this problem will never end.