Hi, I had just been playing my game and was sent a Party/Game invite from a Gamertag I did not know. Since I didn't know the gamertag I only accepted the party invite and there had been 2 people in the group. One of the people requested me as a friend so I could view one of his movies in his theater. After viewing the video I had gone back to the main menu to queue for another match when I noticed that I was level1 again and my game was frozen. I went to dashboard and logged back in and everything on my Modern Warfare 3 had been reset. I asked them in party chat if they'd hacked my account. They denied hacking me but after asking them if they'd reset my account one of the 2 people burst in laughter and the other cursed at me and said "have fun!"