Auto and General refuse to pay for their client's mess!!!

A Auto and General Client crashed into my car and another car while we were at the robots waiting for the light to turn green on the 24th of August in the Joburg CBD. When I got out of the car to access the damage, the driver who caused the accident decided to speed off. I went back into my car and chased him, until he eventually stopped. I signaled to him that he should drive inside the BP petrol station on Joe Slovo and Sontaga Street where we will talk. While he was reversing to drive into the petrol station he bumped my car once again, and at this point I was furious. When we were all eventually parked at the BP garage, he claimed that he was being hijacked and that's why he sped off, which still doesn't justify the hit and ran. Both myself and the ladies in the other car that he bumped didn't see any hijackers, yet Auto and General have come to the conclusion that their client acted in instinct and they are not liable to pay the damages to our cars. This is appalling! This is infuriating, I have always heard that insurance companies will do everything in their power not to pay, but this case was a clear fault on their client's side, and he admitted to taking responsibility for his actions, since having no choice, as I caught up with him when I chased him. He ran from the scene of the accident, and he had no intention to own up to his wrong doing, I even suspect that maybe he was texting, and out of fear and shock, decided to make a run for it!!! I am disgusted with the way Auto and General handled this claim, it means they are condoning such behavior!