RIDICULOUS

I was involved in an accident, their (AIG) client's truck drove into me and will not accept responsibilty now I am told i need to prove that the truck driver was at fault and not me, i have submitted photos, my statement, affidavits and even an accident report that was compiled by a metro police officer that was on the scene when the collision happened. i am told that i must get a statement from an independant witness, WAS I SUPPOSE TO ASK PASSING MOTORISTS TO for a statement in case the insurance company needs one??? each time i have to call and send emails only to be told there are certain documents outstanding - i am still waiting for the manager to give me feedback regarding my case.