I had a small annoyance with Time Warner where they kept offering me TV plans when I wanted to outright cancel the TV. My inner thoughts at the time: "Time Warner person, are you okay? I just said I want to cancel it. I'm worried. Stay safe."

Besides that though, customer service and me generally get along quite well. I think I'd be a very angry person if I was on the other end of it, so I do my best to be polite and understanding. They're just trying to get through the work day, right?