Air suspension problem

2006 Mercedes Benz s430 parked on street someone backs into the front left fender between the left front headlight and left front wheel ,when I noticed the damage ,car hadn’t been driven for one day ,I parked the car Sunday evening and noticed damage on Tuesday morning ,left front fender damaged and left front side of car lower than the right side,couldn’t drive car,contacted insurance company ,insurance co is taking care of the fender but they are saying the air suspension shock was from normal wear and insurance co doesn’t want to take care of the air shock is this fair?