adjuster will not return my calls

My wife was recently hit from behind as she waited in traffic at a stop light. Her SUV is a total loss. I called the insurance company within the hour and they gave me a claim no. and said I would be contacted within 24 hrs. if not call back. Well, we have called back, left messages, asked for supervisor's and we get the same run around. The two times my wife did talk to the adjuster she hung up on her rudely. I work 40 miles from home and my wife needs a car to get to work and treatments for her injuries. What can we do?
It is Hallmark Insurance out of Plano, Tx.

Thanks,
Alan