Vodacom your service is SHOCKING!

I cancelled my contract consisting of 3 numbers by giving vodacom over a month notice to move over to prepaid August 2018. Suffice to say that task alone was fraught with difficulties but eventually allegedly sorted until my account was debited in Srptember. Upon enquiry I was informed this was "a leftover usage from the previous month". I sort of accepted this explanation (I still have the email thread from vodacom) until my account was once AGAIN debited from vodacom for the exact same amount????. So technically vodacom is *****ing my money, the numbers are on prepaid, so what exactly am I paying for that you are charging me every month for vodacom??? I forwarded the email thread to vodacom with questions Sunday 4 November 2018 and am still awaiting a response today 9 November 2018, as with previous experience the telephonic service leaves an awful lot to be desired and I will not be routed from pillar to post. Can vodacom please contact me to sort out their mess that I seem to be paying for!