Oil pressure switch?

Went in to dealer, they said oil pressure switch was faulty. They were going to replace under warranty. 2 hours later they came out with a photo of a chewed up and literally warped or bent bolt still attached to the manifold. They said they did not do it, that it was like that and now they want me to pay over $700 out of pocket for a new gas pump because they said if they put it back together as is that the gas would leak out as the engine got hot. In the photo there were 2 bolts shown one was prmerfext condition and the other to the right of it was as if vice grips had chewed up the threads abd literally bent it. Otherwise it was shiny silver just like the one to the left. I am left dumbfounded and told them there was never any previous engine work. What should I do. Is this even possible that it was previously bent? It doesn't make sense, otherwise wouldn't it have been spraying gas all over for years? Who should pay for this repair?