They are dishonest

I had an accident with one of their clients. They have informed me of not paying the 3rd party claim, however I have given them enough evidence to prove the driver negligent. They are refusing and are saying their client is correct. Although the client is lying and he would be as he is at risk of loosing his job or being reprimanded for the incident. I have even sent sketches of the K53 road rules. Their client states he was waiting for the robot at a slipway, there is no robot at the slipway. He also sketched the accident scene to be the intersection ( slipway), however he does a statement ( not even at the police station) and he says he turned into the road and stayed left. They are taking that into consideration and not my information. the client says I hit him from the back, but I have side damages and not back damages. How do I hit from the back but get side damages. They are the most dishonest Insurance company I have ever come upon and honestly I have read many other stories about them. I will never advise anyone to insure with them.