Car accident!!

A Hertz client drove into my husbands parked vehical at a mall. We did a 3rd party claim so that Hertz can fix our car, they proceeded to say that they are rejecting our claim and that we must hunt down their client and sue their client for the damages caused to our vehical. This is the most bizarre thing that we have ever heard. They are making this all our problem but their client drove into our parked vehical. We have sent all the proof to them regarding their vehical driving into our car with photos and still they have done absolutely nothing about it. I am shocked to say that you are a ******* company that needs to take accountability for your clients actions and not me.