Unsolved debt issue – insurance is waiting for you

Hello together, I have a problem with the opposing insurance: Briefly to the damage: My wife approaches a red traffic light, car goes off (start-stop-automatic). The car in front of her sits back and drives us into the car. The accident opponent gets out and asks her if she would have driven him up and if my wife’s car is a service car… Both is to be denied. My wife called the police. This took the accident, said that she knows that one is lying and s ind again. -> No statement about the damage, but photos with customs stick etc. In the meantime statements to police, both insurances. Was with our car in the meantime at a workshop, who sent a KVA to the insurance. Today’s phone call with the opposing insurance states that they have requested the accident report with the police ( 4 weeks ago) but not yet available. The damage can be understood however still not What do you think I should do?