Gamestop Sells Customer Demo Disc

"Last week when I was in Gamestop, there was a new copy of Steambot chronicles on the wall. I had some extra cash today so I went by to see if it was still there. It was, so I grabbed it and a used game and left. I didn’t look at the disc much when I placed in the ps3. I started playing about an hour ago and when I finally got to a save point I was told you can’t save during the demo version. O-o I pull out the disc and finally take a look at it. "