They gave me a contract I did not want and they refuse to change it

I was using a open line sim only contract and it was supposed to expire in October. A consultant from Cell C called and asked if I would like to extend my contract. I told her I want to extend my contract but as a top up not open line but with the same benefits I am getting she agreed to all my terms. However she kept my contract as an open line and when I called back they told me that I have to pay if I want my contract to be migrated. I told them I wont pay my monthly bill if they want me to pay for a migration. Then someone else called back and told me that they will migrate it but since on top up they do not have a package like I am having on a open line. She will activate an extra 1gig monthly so it can be the same as in top up, I only got the 1 gig once and since October I have been calling they just tell me they will get back to me but nothing is happening when the debit day arrieve they charge me for an open line. They also delivered me a wrong package and I took it back but they billed me for that and later send me and sms stating that they will refund me but to this day they have not refunded me.