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.
(..) Exploiting every loophole, dodging every obstacle! They're penetrating the bureaucracy! - Did I do something illegal? - No. - We shouldn't help our customers? - The law requires that I answer no. - We're supposed to help people. - Help our people! Starting with our stockholders. (..)2004 The Incredibles
(..) I'm not happy, Bob. Not happy. - Ask me why. - Okay. Why? Why what? Be specific, Bob. Why are you unhappy? Your customers make me unhappy. What, you've gotten complaints? Complaints I can handle. What I can't handle is your customers' inexplicable knowledge of Insuricare's inner workings! (..)2004 The Incredibles