I believe reasonable, rationale and calm explanations can yield results from insurance companies. I've done it once, but that was like, 30 years ago.
Having said that, I doubt the ambulance chasing law firms will take a case for a $200 receiver replacement, so the recommendations on hiring a lawyer for something like that just doesn't pass the giggle test.
Just have a reasonable discussion with the adjuster, and if that doesn't work, ask your insurance company for advice. Maybe a call from one adjuster to another will clear it up. In two accidents that were not my fault, my company told me if Im not happy and want their involvement, just ask. Both times I was fine with the resolution, so no need. But, nice to know they are there.
Otherwise, if it becomes a big drawn out deal, I'd just replace it myself and move on.
Mike