Need Help Making a claim! ASAP

My girlfriend was rear-ended by another driver looking for his cell-phone at a stop sign. My girlfriend had no insurance, but he did. Police arrived and made the report but did not write down his insurance info. because he told the police he was going to pay for the damages himself. Nobody was given citations by the police. 2 weeks passed and we never recieved a call from him to get the damages fixed. We called and his girlfriend answered telling us that he was not fixing the damages but his insurance would pay for damages. We never recieved any further calls from neither them or their insurance company.........Now we are trying to make the claim ourselfs but we dont have their insurance information, and they are refusing to give it to us. The police officer who made the report called and left a message and they have not returned the call to him. Now they are saying "talk to my lawyer or take it to court" but all we need is their insurance info to make the claim ourselfs and get the damages fixed. They have done their best to avoid talking to us and seem to be having fun doing it. What can we do to get their insurance information so we can make the claim and avoid taking it to court and waste more time.