Termination of dpp contract

About 4 weeks ago i called multichoice and requested for my dpp contract to be cancelled they told me to pay about a thousand and something in order for it to be cancelled. I have paid that amout but to mu surprise the contract is still active and they are still debiting money from my account. I have calle<br> d several times for this to be resolved with no luck.i want someone from billings to call and terminate this contract. I have rights and fortunately for me i know that.