@MisterXiado Yes you're right. I guess it depends on companies and countries too ( I'm from Switzerland). I took that job while studying, and not as a career plan so I didn't have this kind of experience.
@MisterXiado I used to work in a call center ( 4 years) and it's true that some clients were rude but most of the time they are really nice or they just hang up when they get annoyed.