Which is illegal! If you tip a waiter/waitress then the money must go to them: https://www.gov.uk/government/news/all-tips-to-go-to-staff-under-government-plans-to-enhance-rights-of-2-million-workers
I mean I’m not sure what you can do other than name and shame the restaurant, and/or boycott it
Ha, I never knew this had an actual name.
I thought it was known as talking to a brick wall, ie. if you have a issue talk to a brick wall and you’ll get the answer