Roger, Did you report this overfilling to the garage that did the service for you. Was the oil you removed as new oil should be. I would if mine like to no that the oil was not contaminated in any way, water, fuel etc., which could have caused the increase in level. No doubt the garage would deny they had overfilled. I would be concerned about using that same garage again for work on a car of mine.
Hope things continue to be well with the car.
Best Wishes and Regards, John