Cancel TV service, keep internet - live chat won't connect

I need to cancel the TV portion of my Xfinity service and keep my internet exactly as-is. I've tried the Xfinity Assistant's live-agent chat repeatedly today and every attempt fails with 'Unable to start a live chat session.' I also requested cancellation through the chatbot at least five times over the past three months and never got action, while TV charges continued. Please have an official representative direct message me to process the TV cancellation and confirm in writing. I'm also requesting a credit for the past three months of TV charges given the repeated ignored cancellation requests.