secondary email password reset

My youngest son has a secondary email on my former account.  When we moved 4 years ago, Xfinity wasn't available at our new address, so we cancelled our service.  The email accounts however are still active and used frequently.  I have been unable to reset the password for any of the secondary email accounts through the Xfinity web page - attempting to access any of the secondary email settings sends me back to the primary user page.  I have now been on hold a total of 4 hours with Xfinity support with no resolution.  I know I'm not the only one dealing with this issue - this is totally unacceptable customer service.