How do I get the auto insurance company of the driver who hit my car to followup with me regarding my recently opened claim against the driver?

dry road conditions 2/11/2015. 25 mph behind a DirectTV van on a one-lane(in each direction with a median)residential road. Van pulls off the roadside without blinker and comes to a complete stop. As I proceed on the roadway and reach a point even with the parked van, van suddenly pulls out into the roadway in front of my vehicle as if to use the median pass-thru to go back in the direction from which we were both traveling. I brake, steer left and lay on the horn. Van contacts my passenger side headlight/fender/wheel and continues to "pull his you-eee" even as I am pushed up onto the median by the impact. I called 911, police came, gave me all of drivers information on a printout but did not file a report. there were no witnesses. I called my insurance. the agent took my account and contacted directtvs ins agency, I was given the name, claim number and contact number of that agencys rep to call and provide my account. she will not return my calls. Can I create a demand letter myself?