Can you please help me reverse my Telkom **** debit

I recently opened an account with Telkom. In January they took their first debit order on the 27th, in February, again they debited on the 27th. After an agreement of which they should debit on the 27th day of each month. In March that is where I noticed that something was not normal because on the 27th of march 2025 they did not take out the funds as usual so they debited on the last day of March 31st which there were no funds in my bank account , I had no coverage whole of March by the way saying they were upgrading their systems , I tried calling their cancellations department & they are never available cause I tried cancelling my insurance that I’m paying them , then it continues on April the 27th they didn’t debit they did it on the 30th which again there were no funds in my bank account so now yesterday 26th June they debited my whole salary , now I can’t pay my other debits and rent cause they don’t have consistent dates and they can’t deduct R4257 but I pay them R1000 it’s them on their end not keeping their side of the contract I would like to request my funds back into my account