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.
(..) -No, there's no coconut! -I'm allergic to coconut. -I'm not. A nickel. -Cab receipt. Hey, Puddy. -I'm with a customer. No, no, no. Elaine, the car can wait. What's important is you two getting back together. Then we'll talk about the car. I don't wanna get back with her. (..)1998 TvShow: Seinfeld Title: The Dealership Season: 9 Episode 11
(..) -Hey, George. -Hey, I'm starving. Last one. Listen, you gotta help me out. Elaine and Puddy broke up. He's treating me like a regular customer. I tried to tell you, but you wouldn't listen. No. You were gonna get a deal. There's no law in this place. Anything goes. It's Thunderdome. (..)1998 TvShow: Seinfeld Title: The Dealership Season: 9 Episode 11