MTN South Africa are ******..

My contract with MTN South Africa was cancelled in August called them and have a reference number. The last payment was in October as I was told I cancelled it late. November I was expected to pay MTN South Africa despite the contract being cancelled and called them to make a follow-up and their consultant confirmed that it was cancelled. I asked for the paid letter, and they refused as I know MTN South Africa is ******* and expects customers to pay for non-existent contracts and ICASA is failing to hold them accountable. I checked my Credit Score and boom the paid-up account is in arrears, missed the payment.