Furious Cell C Customer

I am currently facing a serious problem with Cell C, last year after loosing my job I called them to arrange for full settlement and cancellation of my WiFi SIM card contract as I was nolonger going to get money on monthly basis, they told me to pay R2117.70 for cancellation and call after 3 days to tell them that I want to cancel the contract which I did and sent proof of payment, later on I got a call saying that I need to pay 3hundred and something for commitment which I paid, this year around March Cell C started debiting again I called and asked what happened to to the money that I paid they said they allocated it to other months which I did not agree to, and they said they will retrieve the calls that I made to cancel the contract, they did get hold of those but nothing was done they continued debiting. Last month they called me saying that I need to pay 680 to cancel the cotract, I did. Make that payment and went to local Cell C to report That I want that contract cancelled, they told me to pay 3hundred and something again for commitment, I am really not going to pay another amount, what happened to the money that I have paid, it’s more that the contract was about, and now it is affecting my credit score, can I kindly get help. Cell C is a ****. It overcharges customers, they are still debiting even now and I’m disputing it, I’m not a fool, and their service is poor with rude service providers