Cancel renewed upgrade contract

Hi,

My contract was coming to an end, therefore received a phone call to upgrade again. This wasn't to upgrade the device but the airtime contract. I explicitly said to the lady that I do not want to continue with the existing contract after she offered me all sorts of specials. I requested they move it over to a pay as you go, as I cannot afford to be locked into another 2 years unable to change provider if the need arises, nor can I afford a fixed rate. She clearly did not submit my request as I received an Invoice and new statement with the old contract amount.

I then phoned Vodacom, and after a poor explanation that the device and airtime contract divisions are seperate, I need to contact another number. When I contacted that number, they said I need to pay the outstanding amount before they can cancel the contract.

I've mailed and requested that the amount should be reversed as it is not my doing that the bill went over into a new contract.

How do I sort this out. I am more than willing to pay for what I used if that is the issue, however the billing keeps pilling up every month and still don't have access to the network, unable to use the line and load airtime, this has me super frustrated and unable to see a solution.

I need an escalation to someone who is actually able to negotiate and sort this issue out.