The contact owns a 2017 Ford Mustang. The contact stated while the dealer was replacing the tires, the dealer informed the contact that the lug nuts were swollen and needed to be replaced. The dealer was able to replace the tires; however, the lug nuts were not replaced. The vehicle was not repaired. The manufacturer was notified of the failure and a case was filed. The manufacturer informed the contact that goodwill assistance could not be provided and referred the contact to the NHTSA Hotline to report the failure. The failure mileage was approximately 30,000.