Vodacom refuses to Cancel a contract!!!!!!!!!!!!!!

I have an wifi / LTE contract with Vodacom , the contract was approaching the end of term , were i requested to terminated the contract , its been 4 months now , that the contract is expired , but still every month the monies gets deducted for the contract.I phoned vodacom countless times to request the cancellation of this contract and every time Vodacom says that the contract will be cancelled end of the month.But come end of the month the contract is still active!!What is so difficult to follow instructions?I wish for the contract to be cancelled , no i don't want to upgrade the contract or extend it , please just cancel the contract as instructed!!!!!!!!!!!!