
That is unbelievable. I'd be back round there first thing tommorow. Did you take any pics of the wheels when you dropped it off?
I had some damage (not on that scale) to one wheel inflicted by the twits at Kwikfit couple years ago. Had a sudden puncture and no choice but to go there, as opposed to a decent place. Had a quick look on collection but their workshop was so dark, couldn't see much. Once out in the daylight noticed some gouges on the face of the wheel. I contacted them but they were less than bothered, so took it up with their customer services, who took all the details but never got back to me. The only reason I didn't pursue it further was the fact the wheel did have some minor kerb marks prior to the tyre fitting and I could see them wriggling out of it on that basis. Will never go back there.
Those marks on yours are not the type of marks you get from kerbing and the fact they are present on the face of the wheels, on all 4 wheels, and the chap agreed your wheels were pristine prior to fitting, I should think you've got a strong case. Some of those surface scratches should polish out, but I'd be asking them to pay for a full refurb of all 4 at a diamond cut specialist, of your choosing. Was it an independent place or a chain?