Vodacom

Since Jan 2021 I have been battling to get my contract cancelled with Vodacom. I have phoned customer care service and sent emails every time without any luck. So on the 23rd of April a salesperson eventually saw the light and cancelled the contract. But ever since they did not reverse the charges. At the Beginning of May a collection department of vodacom phoned and sent email that I must do affidavit and forward 6 specimen signatures which I have done and emailed every week hoping to get any response but still nothing, nada. Another 5 weeks later and no response except for they have listed me as a bad payer. I AM BEYOND FURIOUS. What next, how does a person resolve such an issue?