GTA3_game hanging.

[mav36]

I was wondering if anyone has had any problems with gta3 hanging. Although my kids have managed to put a few scratches on the bottom of the disc, as soon as you start to play the game, ie drive the car, the floor/road goes blue, then it says disc error and crashes.
Electronics Boutique don't want to know as they say its down to the disc being scratched,but I am not entirely convinced.
Any suggestions would be appreciated.