We took our car to walmart to get 2 new tires, one had a screw in it... 2 weeks later another flat tire on the same back passenger tire, same weird screw and in the same spot on tire. We feel as though it is in fact the same tire. When we reached out the lady said that she was watching the video and saw that it was not the tire with the screw in it... We wanted to see the video and they said that we can't! Now we are questioning whether they even did the oil change we had asked for. Help!