Telkom subscription and usage for ***

I am very unhappy with Telkom. They keep on adding penalty fees. Telkom does not debit me on the debit arrangement date which are on the 31 of each month. Last month they did not debit me at all I can proof that through my bank statements and I could not go to the store because they don't want payment to be paid through eft or cash, only through debit order. They sent me a Telkom statement and my payment of R440.70 is due on the on 01/03/2021 and that payment will be debit on the 27.02.2021. This morning when I got up. I noticed that they tried to debit my bank account on 15.02.2021. and there was no funds available. I don't know what game Telkom are playing but they are ripping me off because there will be penalty fee of R202 added to that amount. This have been going on for the Past 4 months and my instalment only R120