Xfinity won't let me add bank account after THEIR employee messed up

So I went to the local Xfinity store on January 26th to sign up for service as I tried to sign up online and via the phone and no one could find our address.  We also wanted to speak to someone to better understand the pricing.

We signed up for gigabit internet and were given a modem.  The guy asked if we wanted to setup autopay and that their was a discount.  I went to give him my credit card and he said it's "only $5.00 with a credit card but $10.00 if we add a bank account"  I said sure and gave him the bank account info.

On February 19th i got an e-mail that autopay charged us

Then Today (2/27/25) I got an e-mail saying the payment was returned.  I called the bank and they said they saw no attempted charge from Xfinity which would indicate the information was entered wrong.  The e-mail showing the last 4 of the account number showed a total of 16 digits (12 hashes and 4 digits) but my bank account is only 14 digits, further indicating the employee entered it wrong.  I immediately called Xfinity to make a payment as well as added my credit card to autopay.

When I Inquired about correcting/adding my bank account as the app would not let me now, I was told I was blocked from adding a bank account for 6 months.  I spoke to a supervisor that told me that same thing and tried to say "there's other discounts you can do with autopay" and I'm like "yeah but they're only $5.00 and that's a $10.00 discount. It's ridiculous to ask the customer to pay more because a company's EMPLOYEE messed up".

She claimed there was nothing that could be done.  I still believe it's insane to ask a customer to pay more because an employee messed up, I fully believe there is a way to bypass the system and they just refuse to use it because they want more money from the customer.

I'd like this fixed.