Ripping customers by overcharging them

I had changed my banking details and when I used to call the call center, I was either directed to wrong departments or their system was down. I made a manual payment on the 3rd of May which was the same day I spoke to a consultant. I then received an invoice for June stating I owe my normal installment. I then received an sms 5 days before my debit with a new amount which was R200 more. I immediately called the call center and they said I'm owing only R627. On the 25th of June Telkom deducted R829. When I called the call center again I spoke to a rude agent Boitumelo and I requested for a supervisor and till date no supervisor has called. Telkom customer service, management and their network is nowadays pathetic.