One of my first IT jobs was working in a call center doing first level bullshit for a large PC and peripheral manufacturer. We had somebody on staff there by the name of Shelly and she was a raging bitch. Thought she knew more than anybody, would be nasty and short on the phone and would leave comments on the ticketing system like, "user too stupid to figure out where the "on" button is because they had their brain removed". And no, I'm not kidding. She was told, several times, to cut it out and she did for about a week but her need to prove herself better would always rear it's ugly head.
Then somebody called who got her, complained and proceeded to carpet bomb the organization all the way up to the CEO. They were told to get rid of her and they did. And there was much rejoicing.