Contract Ending

I had it with Telkom, I've sent numerous emails to cancel my contract after the 2 year term has expired and yet they still charging me. I opened a case thinking someone would at least call. Apparently they say they did and closed call, you can't close a call if you haven't spoken to the person, they take 7 days after you open the call to contact you. I have just logged another call where I have to wait 7 days until i hear from someone. They charged me R713.86 after my contract ended. For 2.5G it's R696, how is this possible? I hardly use my tablet and I have ADSL at home that the tab connects to. The data is off most of the time. What a *******. I am so disappointed and will never buy another product at Telkom again. <br> I want a refund.