Recently I made a valid complaint to McDonalds customer services dept. about McDonalds poor standards at thier Harben Parade branch at Swiss Cottage, London NW3. The complaint concerned slow service, abrasive attitudes, and matters about unacceptable hygeine standards.
The complaint was passed on to the store by customer services, following which the store's manager, Bakry, promptly banned me from the store. He did not deny that my complaint was valid, but was told that I was banned simply becauseI I had made the complaint in the first place.
Perhaps this is consistent with McDonalds training practices. It would appear that you have to accept their adverse practices without question or suffer the consequences, as I myself did.