No customer service from Telkom

I recently changed jobs and found out my salary date will now be on the last day of the month and not on the 25th. I contacted all the companies I have debit orders with to ask them to move the debit order date to the last day of the month. All the companies except Telkom has made the change effective this month - May 2018. On 15 May 2018 (as soon as I found out about the new salary date) I contacted Telkom via online chat to assist with the change, they changed the debit order date but only effective from end June 2018. After explaining that there will be no funds available as I am getting paid on the last day they still refused to debit my account on the last day when the salary will be available. I contacted Telkom telephonically to request the change for this month and again they refused to change the debit for this month. I was also told that if no funds are available on the old debit order date I will be charged an additional Two Hundred and something rand for the debit that did not go through. I requested to speak to a Supervisor and explained the situation and still no cooperation. In fact I got attitude from both people I spoke to. I requested to speak to a manager and they refused to put me through. This unexceptable. The salary date change is out of my hands, I contacted Telkom as soon as I found out. Why can 10 other companies change the debit date but not Telkom. Telkom is blatantly trying to rip me off. So from my side I have opened a new bank account where my salary will be paid into. All other companies have been informed. I will not inform Telkom, they can go ahead and cancel my subscription. I will find another service provider. I was considering moving over to Telkom when my cell contract ends but will definitely not be doing so. I was also planning on increasing my wifi plan in June but will not do business with Telkom if this is the service I am getting on a simple request to change a debit order date. Shame on you Telkom!