As long as those rails are still fixed and solid, there should be no vibration and damage to the verge from them? Must've been from installation, so fix it, whatever is wrong with it, and see if any damage occurs again, which is doubtful looking at the install.
How is the flat roof panel array held down, ballast in buckets? If so, it cant really damage the roof unless not enough weight is in there and it slides around? But with 2 winters behind it now, is also doubtful.
If you've had a full refund, god knows how you managed to get that, I dont really know what the issue is. The system is working, you're generating and getting free power when the sun shines yes?