Won't let me pay by bank account or add a new payment method

I can't pay my bill via bank account. I even tried to pay with aa  new debit card. Representative said I was transferred  to them automatically. I informed him that II called them directly. All I want to do is set up a new payment method and find out why only credit cards are accepted on this account. I just want to pay my bill!!  GUESS WHAT???? It's going to be late because I can't settle this matter!