Incorrect Fibre Amount Debited TWICE!!!

I am a new Telkom Fibre client that signed up via online sales dept in June, I was quoted for R581 for my fibre connection. My last month debit order went off for R619, so I called them to query. I spoke to someone in billing, they said they will investigate, and rectify it. This months debit order went off again for R619, so I called them back again to rectify this. I spoke to Siphumelelo at Sales office in Durban, she is going escalate the query again, where I asked them to listen to my sales voice recording to hear I agreed to R581 and not R619....!!!!! I am so irrate and disappointed in Telkom, they have been debitting my bank acc incorrectly and the problem just cannot be sorted out???? My service number is B*** and my contact number is ***.