Remember, the 'customer' is always right. [=never argue with a customer]
He is one tough/tricky 'customer'. [=he is a tough/tricky person]
The company has good/poor 'customer' service.
(..) I'm gonna go downstairs and see what else I can find out. You said somebody's a saint. Who? A customer. Fatima called him that. Who's Fatima? Ali. Ali ibn-Ghazi. We were friends. (..)2018 TvShow: The Alienist Title: These Bloody Thoughts Season: 1 Episode 4