Let the dealer solve this problem and report in writing to the leaderships OWNER and cc the service manager. I would do this because of the irresponsible service. In addition: the undercover should be removed and power-washed to remove any oil stains remaining.
Dealerships should provide a gold...
I am using Mobil 1 EP and have an excellent UOA. I therefor will continue to use it at a 5,000 miles recommended change interval based on my driving profile. Short drives of less than 1.5 miles per drive is my normal.