How do I file a complaint about a specific individual or individuals?

I was told on Friday that my issue -- which should have been resolved by then -- had been escalated to a "corporate escalation" team. Someone named "Cecilia" called me on Saturday. I was eating and asked her to call back later. She said she would, and she also sent an email Saturday afternoon that said she would call in a few hours. She did not. She was conveniently "out of office" until this morning. She called around 10 and would not stop interrupting me. It is exceedingly rude, especially in a work capacity, to keep interrupting and talking over customers. This is NOT acceptable. I told her I wanted to speak to her supervisor. Her supervisor "Eclipse" finally called at 6:30, and she also would not stop interrupting me. I kept asking her to stop interrupting me and she refused. To add insult to injury, she didn't bother listening to actually comprehend what I told her. She listened to respond only, and in the process she failed to understand what she was told. I didn't ask for Cecilia's supervisor on Saturday because she lied and said she would call later Saturday, so whatever Eclipse's excuse is for supervisors not being available on Saturday is completely irrelevant. I didn't ask for one then. 

I am astonished at how bad Xfinity's customer service is. It's no wonder, though, with people like Eclipse as leaders. I have now been waiting since Thursday and dealt with your agents across multiple access points, starting with your overseas chat agents who followed the usual lie-transfer-ignore format. Whoever answers your Facebook messages ignored me from Friday until this morning and still haven't provided an explanation why they did so. Whoever answers Reddit gives me one nonsense story after another. I still have no resolution for an easily remedied issue, and I am absolutely beside myself at how bad your customer service is. At this point I don't know if I should even ask a question for future reference because I don't think any of your agents is trustworthy.