5 months to cancel a contract

<p>I had a contract with Vodacom which I cancel on the 23rd September 2016. I paid almost R8 000.00 to get this contract cancelled. They every month I have to pay R 759 and then I query the account and they credit me for the previous month but they invoice me for the next month. Which part of cancel the contract don't they understand.</p> <p>The number that I need to be cancelled is ********** </p>