I’m a Comcast customer and I don’t receive these at all. I just get “your bill is ready to view” and that’s it.
Which makes me wonder what’s wrong with your account. Is it a regional thing where one comcast region is bugged? Do you have a duplicate sub-account that you aren’t aware of that has the setting? I never set up my “comcast email”. Do you have that forwarded to your main email?
Not defending them at all, just trying to understand how this could happen or help you get rid of the emails.