Swindled at the report

Hello together, have a problem again. I recently bought an accident car. The owner had all-in-one on the car and got his money from the insurance company. I bought the car for the remaining value, which was on the report. I noticed during the disassembly that the car had had a strong front damage once, since the left body frame was extended by two bars so that you can screw the whole front on it. As if I got a copy of the report from the previous owner and approached him about the damage. He only said that he bought the car as an accident car at the time and that he can no longer find the purchase contract to call the Fuscher. At home I looked at the report correctly and noticed that in the section “Pre-damage” this says: “At the inspection, as far as without further investigation is known r, no repaired or unrepaired pre-damages have been detected. As it looks like, the guy didn’t say that the car had an accident before. What would you suggest me to do now? I think I paid too much for the car and the residual value according to the report is no longer true by this discovery. Did the guy cheat his insurance by concealing the pre-damage? Please help me, what should I do now?