How do I make a complaint?

I have been having issues with the DVR service for Xfinity and I called and got the AI tech which was awful. It did not understand my issue but said that there were some errors on my account and it was going to reset (reboot) my service and that I would get a message in about 10 minutes asking if my support needs were met.  My system never rebooted but I did get a text message, and I answered that my issue had not been resolved. Then a human was texting me and asking questions clearly had no idea what my issue was as the AI passed nothing along. After about 30 minutes of texting, they understood my problem. Then all of a sudden without notice somebody else was texting me on the issue and the person who finally understood was gone.  So, I had to start all over texting with the second agent. When they understood the issue, it had been 55 minutes. They said they would escalate my issue, but it would be 24 to 48 hours until it would be fixed. They were going to delete the recorded shows that wouldn't delete when I tried to do it. The DVR service had worked great for years but during the last month shows would often not delete after I deleted them. Anyway, I waited the 48 hours tried to delete the recorded shows and the problem persisted.  I called and got an agent on the phone, who of course did not understand the issue and walked me through the process on how to delete a recording. I said it's still there and she said it can take up to five minutes. I said I've been deleting it since October 27th and it's still there. I asked whether there were notes from the escalated service and she said yes but read me the notes from my text messaging service two days prior. I called her on that and asked again for the notes from the escalated support, and she conceded that it was never escalated. I even told the person two nights prior via text that she was just saying she was going to escalate but wouldn't actually do it and it turns out I was correct on that.  This time I got some kind of escalation number code. We'll see it anything happens. This is standard customer service from Xfinity. The customer service person I was texting with on the initial attempt actually tried to upgrade my service. I laughed and said I am more likely to leave Xfinity than sign up for more stuff. If I had another option that gave me our Twins, Wolves and Wild games I would do it in a second and never look back.