I feel for you. But trying to prove it may be difficult, it may then increase the cost to repair just enough for them to total the VX instead of repair. I would instead ask that after the VX is repaired they also pay for a detail jod that includes the best type of cladding restoration you can find. Beleive it or not some of this stuff restores the cladding to black (yeah yeah gray blah blah blah) and then just keep up the cladding care. After all this is the same as trying to get an overall paint job for a fender bender.