Extremely angry client

Good day

From March 2019 I have had several calls from Cell C agents wanting to extend my Contract with them. And on those several occassions, I have mentioned that I do not wish to have the contract extended and wish to cancel that agreement. I am puzzled that this month again I am debited for a contract I simply requested to be canceled. The whole of yesterday (26/06/2019) I have been calling your customer care attempting to cancel the agreement again, however everytime I am transferred to your cancellations department, the call cuts and says number doesn't exist. None of your agents could give me anything tangible in order to get this done like I requested previously. Is anybody gonna help me to get this thing done already and have my premium reimbursed???