These are not diamond cut wheels, and are a nightmare to get repaired, i believe that there are only a couple of places that can do them, when i looked into getting mine done it was around £700 to get it back to factory finish and they required the wheel for a good week, or they did a local repair which they said would look pretty invisible from 1 meter away for £150 ( not sure how long they needed the wheel for this )sorry i can't remember the company name, i think they were up north somewhere, i was going to have to send them the wheel
I was lucky that my Local Dealership has a very good repair guy, I have used him for years, how he repaired it i dont know but he made a pretty good job, is it back to factory finish, no, but i think you would have to look very hard to see it. ( £95 ).
top 2 photos are the damage, bottom 2 the refurbishment.