Cancellation of contract

Good day - I have send previous emails to retentions.cancellations to cancel a contract ********** 229. I pay every month more and more even if I took my child's sim card - the sim is not even in a phone. Vodacom send me a invoice again for R1045.84 I eft the amount - still my emails was not answered from rententions and my contract is still not cancelled. I am fed-up with vodacom. Please cancel this contract. The nr can also be cancelled - with immediate effect. You are billing me for ever but sim card is not in a phone. I am very dissatisfied with Vodacom.