Bad billing system

I am so disappointed with not able to change banking details online or on email with Telkom. They will not change my new details to facilitate debit order, which means my dr are unpaid and I have to pay bank fees as well as R200 to telkom for unpaid fees. In this day and age and online facility why should I go to a telkom shop to change my banking details. This is not service delivery Telkom. Am looking to move my service provider when contract ends!