Can't disagree with any of the above comments. I have a decent amount of experience with insurance co.'s and my advice is to stand tough. It's quite obvious this is related to the accident and upon more investigation, the mechanics should discover this.
Be persistent (but not annoyingly so) with your carrier. Let us know what transpires!
On another note, I'd also find a good indie -- I don't recall if your up in Madison now, but if you are, you know my opinion on this one!