How do you appeal a claim against you by your own insurance company's claims dept when you can prove you were not at fault?

Something similar happened to me. My own insurance company was actually going to just pay the other person's insurance company since they had decided I was "At Fault". I wrote a letter that I was not in agreement with this and stated my reasons why I was not at fault. It went into arbitration by a third party and I was determined to be NOT at fault. I believe you have to contact your company, also check the Wording of your policy for how to handle disputes. I did not have to go to court or anything like that, only a simple letter stating my case. Hope you get this resolved. God bless, Cathy