adding bank detail

This is not the feeling we want for anyone, user_ey0u91! If you have Xfinity Internet and enroll in automatic payments and paperless billing using a stored bank account, you’ll receive a $10 monthly discount. The discount usually starts within 45 days, but it may take up to two billing cycles to appear.
Automatic payments and paperless billing discount

I also wanted to share how you're able to set up autopay:

Sign in to your account.
Go to Billing > Bill Settings > Autopay.
Choose or add a bank account (Plaid is used for secure verification).
Agree to the terms and click Set Up.
You’ll get a confirmation on-screen and by email. Let me know if you’d like help walking through the steps!
Set up or turn off automatic payments in your account

The concern is not "E-mail" help related............ Topic moved here to the proper help section.