TELKOM DEBITED R4983.82 FROM MY ACC WITHOUT MY CONSENT

Telkom is the worst company I have ever dealt with. Since the time I started my cellphone contract and my fibre contract I have had endless problems. My monthly installment is R799 and a couple of months ago fell into arrears due to personal reasons and was handed over to their lawyers with who I made payment arrangements. Telkom has just debited R4983.82 from my bank account without my consent. I did not sign a Mandate for this amount so who gives Telkom the right to just debit any amount they wish to from peoples accounts. This is not the first time this has happened. They once overcharged me with more than R1000 and it was such a struggle to get my money back I eventually just gave up. You are guys are heartless ****** and I cannot wait for my Fibre and mobile contracts to end. I will never recommend anyone to you people. Your call centre agents dont even know how to assist with simple things half of the time and I spend hours on calls with your agents. From your billing system right down to your Customer Service CC is ridiculous. How am I supposed to pay the rest of my bills. What is the use I made a payment arrangement?