Multichoice owe me R4000 but won't pay me back!

Multichoice have taken 3 x R 759 stop orders via my ABSA bank account. They have also taken a further<br> R 1654,90 as an ad hoc direct debit despite my written instructions for them to cancel my direct debit order. In total they owe me R 3931.9 yet each month I have to pay in cash R 779 or they disconnect me. I have called them at least 30 times. I have emailed them proof as provided by my bank manager. My bank manager suggested I write to you as I can not get any further in my efforts to resolve this situation. Please can you help me. I am a single mum on a very limited income with a sick child. I would cancel the package but it is my child's only current form of recreation. I am grateful for your time and consideration. In fact I am delighted you offer this service. I have spent a lot of time trying to deal with them . I have spent hours on the phone patiently explaining the situation butr get nowhere.