Billing Issue

I have been querying a billing issue with Telkom since the month of Feb. In February, I called telkom to change my banking details, the agent confirmed that this has been done, only to find out that Telkom will only be deducting using my new banking details in March. Naturally, my account was in arrears (and apparently handed over to debt collectors, something which only came to my knowledge in May). Fast forward, my account is then double debited ( for Feb and March)successfully on the 15 of March, with an explicit description on my statement stating that Telkom has debited the account. Due to the account being debit prior the agreed debit date, a debit did not occur at the end of March as it has already been deducted on the 15th. Now in the month of April, I check my statement and realise that Telkom has once again not deducted my account. I go on to call the contact center to understand why Telkom did not attempt to debit my account, as the debit order does not appear to be returned on my side. Whilst on the conversation with the consultant, Teboho, he failed to provide me with a definitive explanation as to why Telkom is not deducting (Keep in mind, that Telkom has my banking details). I then asked Teboho to confirm that my account will not be handed to debt collectors again, as Telkom did not attempt to debit, and again, Teboho failed to confirm anything. I pleaded with him to find a solution and revert as to how Telkom will fix the problem, and as usual, a consultant will remain quiet. My airtime then cut, and with no surprise, Teboho did not bother to call me back. An email has been has been sent to a Mr Cele who happens to be the manager, and unfortunately consultants are not allowed to give away Terrence's email address (which i don't get why) as this is a valid complaint. Telkom must fix this unnecessary billing issue, I cannot be calling each month to sort out my billing. This is ridiculous.