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.
(..) Come on, Tony. Don't be a schmuck. Did you hear that guy? You got to Iisten to him. You'II Iearn something. Stay with us. You're a weII-Iiked customer. You're in good hands with us. BANKER: And I got to run. TONY: I'm safe but poor. -How's married Iife treating you? -Better than you are. (..)1983 Scarface