Pass the buck, how lovely. Your company's name is still on the game when it pops up on the screen, is it not?
How do you know it's not the PC users of this game that are the ones that are getting it completed?? Hell, even another person that posted on this site posted that she was having the exact same problem as myself, and that she bought ANOTHER copy of the game and had no positive results with that one either.
Also, gamestop.com's forum has a couple people complaining about the problem as well.
I think your company needs to look into what companies they give their games to too refomat them for PS2's. Cause obviously Ubisoft didn't do such a bang up job here. A recall perhaps?