Contract of sale signed, then found that accident; what now?

Hello, I have a little problem. On Saturday I bought a VW Passat from a car dealer who ran as a VW business leasing. I looked at the vehicle before and I also drove a sample. So everything was ok. I asked the seller for damages etc., whereupon he meant that he had nothing. So we put on a purchase contract and signed it. I can pick up the vehicle in the middle of the week. He has not seen the money yet. Today he could not e i look over an acquaintance into the service course of the vehicle and have found two unsightly things: 1. front door replaced, door dented back, painting, cover f door rear/bumper front a+e etc. and several thousand kilometers before 2nd side window pane covered, wheel house shell rear disassembled and built in, tank flap and spoiler rear down and built in, tires replaced, VEHICLE DISCOVER, side part rear finish painting… Now I feel like I’m from the handle What would you do?