They used wheel acid and either sprayed it on without wetting down the wheels first or left it on to long. I use the same on my sport wheels every week at my detail shop but never have a problem because I rinse them off after less than 1 minute, Thats all it takes with the acid. Have to very careful with that stuff! Your looks like a classic case of wheel acid damage left on to long. I would hit the detail shop up with a bill to repair the damage they did.
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