Erie Insurance refused to pay auto claim Mechanicsburg Pennsylvania

On 8/17/21 Erie insured driver backed out of parking space at the P.O.   Hit my left front bumper with his back left bumper.  I was standing still at the time, leaned on my horn loud and long, he still kept coming, then proceeded to go forward and leave.  I kept leaning on the horn and he stopped.  Driver's wife in backseat asked if I was all right and said not to worry they have insurance.  

Deputy in P.O. heard my horn, came out to investigate, wrote a report. Erie driver did not report accident to Erie.  I had to a week later.   Erie adjuster on 9/07 assessed the damage to my car and on 9/15 I received a notice that Erie would not honor the claim.  Spoke to Supv. Kelly Ahlers, still rejected the claim.  

Erie has a flawed claims payment process.  There are many complaints about them online,  and many of them from their own insured.  Saw 116 complaints on BBB, but there is a lot more out there.  I am making my voice heard as much as possible and would be open to any information as to what can be done to stop companies such as this one who is unjustified in treating people this way.