I just bought a NEW (condition) PS3 game on amazon, unfortunately it was sent to me with lots of damages on the case, can I still sent it back and get a new copy - even though I have already opened it?
Was it from the main Amazon, or one off the sellers on there?
If the case was damaged before you opened it, you should have went online and sent them a message about it (i believe there is also a IM type customer service they do, which from my previous experiance has had any issues resolved very quickly)
So just the case, or the disc? I'd just buy a new case tbh, not worth going through all that drama. If the disc is scratched and they've re wrapped it, however, I'd be calling them out on a used pretending to be new game.