Telkom bad contract cancellation experience

I have have been a customer to Telkom mobile for almost 5 years now been renewing my contract everytime, this year I decided to take other commitments so I had to cut some expenses including my contract because it had come to an end but the experience is very horrible. Even today they haven't cancelled it my bill is going up, I have several emails to prove that I tried from the start of January till today they don't wanna cancel my contract and to be honest I can't afford the contract I just need my number as prepaid because I can't afford to change it now for my job applications. I feel Telkom is forcing me to pay for what I don't need.