Very Dissatisfied customer

Mondo upgrade my cellphone contract without me agreeing to this. A call agent called my and tried to sell me a contract and I told her to send me the quotation before approving the contract, she went ahead and approved the contract without me seeing the official quotation. I have called Mondo several times to send me the quotation before approving the contract, but to my dismay no quotation was emailed to me to this day... So how can I approve a contract without seeing the quotation. I called to investigate and was provided with a reference number and according to Mondo the investigation was invalid. I asked for a copy of the recording and was told to go to the nearest Vodacom store to get a copy during COVID-19, so that I can verify if that is my voice which I think is unacceptable. Why can I not get a copy of that whole recording from beginning to end to see if I did approve another 2 year contract, which I don't recall approving.