I am so sorry to hear this. My understanding is if you only have liability insurance under no circumstance can the insurance agent help you. however you might wanna call your insurance company to find out if they can find any solution.  If only you had full insurance hit and run situation would have automatically count under uninsured driver  but its not the case here. I feel that survillance video is the only way to track that thug and make him pay for your damage. follow up with the cops . good luck