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.
(..) Mm-hmm, anything else you can tell me about him? Yeah. The guy was a major Wang. No, seriously, he was, like, our rudest customer ever. He used to always talk down to me 'cause I'm a girl, like I couldn't possibly know anything (..)2016 TvShow: Bones Title: The Murder of the Meninist Season: 11 Episode 12