Blocked from Entering Bank Information to Receive Discount

In August 2025 I ordered internet service that was to include a $10 discount for autopay. When I placed the order I had to provide my banking information to set up the autopay. When the first bill came due I was informed that there was an error with my bank transaction and that the payment would be reversed. I double checked the banking information to ensure it was correctly entered and it was. However, the payment did not process so I had to enter a card for payment. This event then led to an additional $25 on my next bill for a echeck/EFT return fee charge and I am no longer eligible for the "autopay" discount using a card. My account says that I am blocked form entering bank account information for payment. Multiple agent chats have been unable to resolve the issue and I am told to contact my bank. I am unclear about how contacting my bank is going to remove the block on adding bank account information enacted by Xfinity. All of my other banking activity occurs without issue or delay. As I search online, I see numerous other customers have run into the same issue. Thus, this seems to be a deceptive practice by Comcast to charge customers more for their services than what is advertised. I would welcome anyone from Comcast to contact me to resolve my autopay issue to reinstate my "autopay" discount.