MTN, how can I brighten up your day is sommer ***... more like How can I worsen up your Life!!!...

So I get a call from Summer Mobile, apparently they are affiliated to MTN, for an upgrade on my contract In January (which I have had for many years by the way) I agree to a data upgrade telephonically and am contracted telephonically as well. My paper contract was sent to me with an amount of R230 but I am being billed R613 consecutively since the upgrade in January. When I query it, MTN refuses to send me the voice recording of my contract, no adequate feedback or follow ups have been made regarding my refund, and they do not debit my account for the last month., I know this is not going to end well. I want to go to the ombudsman, but they refuse to send me my voice recording contract.