Honestly keep fighting! Thats some BS right there.
A taxi hit my friends rear bumper once while driving in the city and it literally took 6 months for them to pay. They had some ghetto insurance apparently and finally took the bill. He paid for it in cash already due to it was getting flaky the paint.
I hope in the end you win and have to pay no deductible. Any pictures of the damages ?
You might want to lawyer up or have him send them a notice to the company then they will take it seriously. That works almost every time but lawyers can be costly.