I was hacked on MW2 on PS3...how do I get it back to normal?

I was playing team deathmatch and all of a sudden my gun disappeared, the game went to a third person pov and then the server timed out...It looked like a plain ol' glitch UNTIL I got back to the lobby and my gamer tag was changed to [CU**], my primary weapon was a smoke grenade, all my challenges were gone as were all my weapon packages and perks! I was already at level 70 and was planning on prestiging in the near future so I just did it early but when I tried to prestige to get everything back to normal...NOTHING HAPPENED!! I couldn't even Prestige...Someone Please Help Me, I feel d and so violated by all this. If you want to hack to make Yourself look better or feel better then by all means do it...but if you're messing up MY game or Other people's games than that's just not cool...Learn to hack properly so you can spoil the game for yourself, don't go be a douche and spoil it for people that paid to play a game.