Account not cancelled and have been charged

I am complaining about having put in a cancellation request 40 days ago and I have not been cancelled and have been billed for the next month in advance. this needs to be rectified or i will take this matter further. I will not have a bad mark on my credit for something I have cancelled and your incompetence cannot even get that right.<br> fix this telkom or i will become a nightmare of biblical proportions.