Had the same issue about a year after getting mine. An unfortunate steering error when on my dads driveway caused a bit of a bad scrape to passenger side front and back as I slipped off a curb!
Emailed my local dealership the day after and got quoted £668.29 incl VAT per wheel. This was for the 10 spoke 18" wheels. Flagged the message so I would remember to talk to them next time I was at the garage, spoke to my aftersales guy and he recommended they get refurbished instead as the damage isn't too savage and he recommended a company called Pristine Wheels which seem to have a few agents around the country. Haven't got mine done yet, will be getting a quote from them early next week! Will make sure to come back and let you know if I got the work done and for how much etc!
I was speaking to one of the master technicians a little later when we took my car out to ensure the issues were fixed, he said Pristine Wheels are a very reliable company that he has personally used before, he seemed to think i would be looking at no more than £85-100 a wheel.