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.
(..) Terrific. I said I was sorry. Asshole. Christine! Mr. Van Orton is a valued customer. Fine. Then you kiss his ass. Don't you talk to me like that. I apologized, (..)1997 The Game
(..) at your brother's discretion as a gift. It's dependent on your satisfaction. Does that mean that if I'm not happy he doesn't have to pay? That's never happened. We've never had an unsatisfied customer. I think you mean, dissatisfied. That's right. You're a left-brained word fetishist. (..)1997 The Game