Xfinity refusing to repair damage to car

My car was damaged by debris that fell if a xfinity  cherry picker truck driving down the freeway.  I attempted to get the drivers attention to pull over. He looked at me but refused to pull over. After following him making myself late for work I gave up. I contacted xfinity. At first it appeared they were going to take responsibility and repair the damage. Then stopped any contract. I was contacted by the insurance company who said that xfinity is denying anything fell off the truck. I took a picture of the truck which showed unsecured equipment in the open back if truck.  

I'm going to be canceling my xfinity service which we pay $180 a month. I refuse to support such irresponsible behavior.  Someone could have been injured or killed from large equipment falling off a truck traveling 65 miles per hour down the freeway.