Level of incompetence is bull

I am extremely disgruntled by the invoice I received from telkom, it shows that I am in arrears but I have requested for cancellation. To my surprise I see that I have another contract of 50/50mbs which I did not agree to. I am so tired of Telkom, there service and competence is utter bull. I want this sorted out as I will not accept any outstanding balance. I called the other day and advised the agent that I have requested to cancel it, then she says try again, then I asked her what about the outstanding amount and she says just cancel and it will go away afterwards. *** What is this?