Try to call them, there is NO phone number to be found, it takes a research project to cancel your service.
Use A Satellite Provider, they do internet.
I called dish...when I last moved. They referred me to ..ATT!
I have no idea what was going on with that...as Id think if they were an isp locally....theyd have service through their own company..
Um...1-800-comcast
Gets me service every time. They know who I am when I call because their system recognizes my number. I've never tried to cancel because I don't have problems that would necessitate that. If they jack the rates, we get on the phone, negotiate, cajol and sometimes threaten switching to Verizon FiOs. we always get a better rate in exchange for re-upping. That has only been required twice over a 10 year period.
I think that people's Comcast issues are regional. I live in MA and haven't had anything to cause me a screaming fit when dealing with them.