HIGH BILL CHARGE AFTER CANCELLATION OF FIBRE

Hi, I have taken a telkom fibre contract about 2 months ago. It was a month to month contract and as a customer I was experiencing numerous issues. There was a technician who promoted telkom to me and he installed the Fibre. While experiencing issues I called the technician countless times and he made empty promises stating that he will come to have a look into the matter but nothing was done. Being left in the dark with poor and pathetic customer service I work from home so I had no option but to cancel the Fibre month to month contract. I have paid my installment that was due after canceling. Today I received a bill from telkom for R2700. What nonsense is this?? I tried contacting telkom billing and have been told to call numerous numbers. You can't even get ahold of them yet when you take the contract they quick and are available then. I will not be paying this bill and demand telkom to sort this issue our because I will put an article in the paper. Many people who are struggling to make ends meet get bluffed by technicians promoting telkom and then get stuck with situations like this. I have all reference numbers as well as the technicians name. I will not advise anyone to go with telkom it's just a money making scheme. My contact number is ***