If these are the original wheels and you’re sure there’s no evidence of external damage (kerbing, careless tyre fitter, previous repairs, etc) then you might like to have a robust conversation with the dealer about whether this premature failure is reasonable and see if he’ll contribute to the cost. Can’t remember now whether the anti-corrosion warranty covers the wheels but do check that. Good luck.
If you end up going down the repair route, then why not buy one spare (even a cheap steel wheel) and get the alloys done one at a time so you’re not off the road at a difficult time? Or, if the damage is just cosmetic and not structural, leave it until a more convenient time?
