Vodacom deducting money after they have cancelled our account

Although I received the email pasted below this has not been actioned! We still have money *******ly deducted from our account. Vodacom refuses to talk to me.

We acknowledge the receipt of your email. Kindly be advised, our records indicate your cancellation request for number *** was logged by us on the 31-08-2019 and the cancellation was loaded for the 30-09-2019.