Telkom mistake leads to costly debit rejection payment

In January I had repeatedly requested a call back from a consultant to change my bank account details as I had changed banks. After eventually being contacted a couple of days later. The consultant took all of the information of the new banking details and asked if there is anything else they can assist me with. Here comes end Jan no payment deducted. I eventually have to make a manual payment. And now Telkom is charging me a debit rejection as the bank account on record is still the own bank account. The rejection is the same amount as the LTE contract monthly installment R199. Which is excessive but this is not my mistake. Telkom needs to own there mistake and reverse the fee on the account. Now this month it seems it will happen again because they need more then 7 working days for the account to be changed before payment has to be deducted.

So all of a sudden my affordable LTE contract has doubled for Jan payment and Feb Payment. But I do not get double the data.

Please rectify this.