I was given a copy of FIFA 12 for Christmas 2012. A day later, I put in the disc into the XBOX 360 S for the first time. After an hour of playing 'Career Mode', I heard some noises from the XBOX, so I turned it off. When I turned it on and tried to play it, it says 'Disc Unreadable' and to clean the disc/disc tray. But when I took the disc out of the XBOX to clean it, I discovered a very deep circular scratch on the disc. I checked the disc tray and I found no foreign objects or dirt in it. They say that the XBOX was moved, but it was lying horizontal on a laminate floor. What can I do?