Question of guilt

Hello, I went home today with my wife from shopping. After a roundabout comes a small road which has a curve and it is a bit tight, but not that something happens. But today there was a bang, mirror. The accident opponent does not want to admit the guilt, where I have to emphasize he has no witness I already. Now I do not know what to do, I have already reported the damage to his insurance. Should I get another lawyer to do it? I have no desire to be To pay damage because I drove right, I know the road and how to drive there. Would be grateful for some tips. MfG Christopher.