Go to another dealership. Over Torqueing the cluster would general break the screw mount areas not the plastics in that area. That's absurd.

It does not show signs of impact. Most dealerships would not even blink at covering that. I just had a roof rail replaced due to a slight bubble under the paint. Nothing major but they covered it because the SA was cool about it and it was no major deal. I didn't care if they did or not since it was minor. The Roof Rail is a major labor job cost again warranty and not even a blink.

Sounds like they don't now how to get warranty claims paid when it is in question.