Hidden charges on the contract

I had a contract with Vodacom from 2022 until May 2025. During the time I had increase on the initial contract, when I query they told me about the advances taken. I cancelled my contract on the 2 handset devices. A consultant told me to upgrade. I told her I am trying to cut on costs. She advised me to take a handset and I will be paying 200. I told her I will think about it and she can call me another day. Then she called me, I agreed on the new handset. Agreed based on I will be paying 200. To my amazement come month end May I paid 600 something. I called and and query. Nothing was done. Month end June I paid 400 something. I called again. I was told about the insurance that I did not agree on. Apparently it was on my last contract. My question was I agreed on the new contract because I was going to pay 200. They put me to insurance to cancel. Month end July I still paid 400 again. I just called them now. What I was told is There still insurance which was submitted on the 12th. There is charges on the other handset, the contract was not canceled. I have to cancel it 1st and put it on prepaid. My question was in May I canceled the contract moes. The answer was it was not canceled. My query is the consultant only told me I will be paying 200, but I am paying more than what was agreed. Double the amount. When you call them they take you from pillar to post the problem is not resolved.