How to report Rude customer agent ? Or misconduct

I called Xifinity customer Rep today  and as i was explaining to her something about my Plan  she cut me and said “ Sir, Sir, okay can you let me finish what im saying and then we can talk about that Later ? “ i stay relax and let her finish and the. She said something that Dont match what the In office customer agent  told me. Says my plant will cost 95$ to renew Vs 80$ at the in office agent. Okay so either she dont know what she was doing, or not aware of something and Completely rude in a way she talks so Customer whos feeding her, whos giving her Air, gasoling, and food in the Table. I think we have to escalate this and take this to a whole new level and tell Their Managers to TEACH YOUR CALLING AGENTS / REP to be a nice person and not be Rude. To all Rude Agents  never say Sorry who you disrespected , YOU should feel sorry yourselves coz you're are that kind of Person and were Not, Okay ?