Misleading consumers and terrible service

The terrible services and lies continue at Vodacom, I received a call from one of the call center agents, offering me a data sim to reduce my current installment at Vodacom,upon explaining the option to me the consultant concern there will be no additional cost and this will not be an additional contract,however it seems they like misleading people just to close a sale. To my surprise my debit went off this month and it was much more than I anticipated, when I called the call center to inquire, the lady who assisted me was absolutely rude and did not even send me a reference number for my call as I had requested. I would like this line to be cancelled as I have not agreed to paying any additional amounts and I would like that call to be provided to me so I can take this matter further,This type of service is unacceptable