the person is inviting people and joing into public matches and modding them for unlimited xp this persons gamertag is - [GT Removed]
You are not allowed to call out other gamers on the forums here. Use the dashboard reporting tool to report them to the PET members and they will be dealt with there.
writing for GamerLiving.net
Like mentioned, don't name and shame on the forums, it's against the rules.
Just file a complaint against the user in the category of System Tampering and Cheating.
Next, you need to Block Communications, Avoid the player and move on.
Unfortunately most Call Of Duty games are prone to this and then only way to deal with it, is to do as suggested.File a complaint against the user, avoid the user and block communications.