Need to cancel Xfinity service while still living

Hello, I need to cancel my Xfinity service at my Seattle property. I am currently outside the United States and have already spent considerable time over the past several days trying to complete the cancellation online without success. I previously posted here seeking assistance, but have not received a response.
The only clearly available online cancellation option I could find appears to be for a deceased account holder. Since I am, fortunately, still living, I would appreciate assistance completing the cancellation and having the account reviewed to reflect my earlier efforts to terminate the service. Thank you.