scratched

since i got my repaired Xbox 360 last week, i've been playing Rainbow Six Vegas 2. sadly, that game disc is now rendered useless, thanks to another Xbox 360 flaw - it scratches discs! when i tilted my console i heard a clanking sound but didn't know what it was until now. i tried to start my RSV2 game but it froze. when i took out the disc and examined it, there it was - a large circle of scratch! i can't believe i got screwed by Microsoft again! unfortunately this is one item i can't return for repair. if anybody knows some magical elixir to fix my disc, please let me know. thanks!