get rid of my comcast.net email address

when i login to xfinity and go to account i do not see the email address that i need to delete. 

using the assistant is useless, its a merry go round.

i see no phone number to get a real assist.

i get emails , usually phishing with that email i want to remove.

i have no way of checking it ; but folks say if i don't check it it will go away, that is nonsense, as i continue to get these emails.

if any of these have solutions please suggest one.