My prepaid account is continuosly billed for subscriptions ive never requested for

I have been back and forth with Vodacom ,Requesting them to remove anything that keeps on making subscriptions on my Account and that I for one don't play games neither do download music on my cellphone,yet my airtime keeps on vanishing each an every time I recharge ,have called them for several times with no luck hence the problem still persist just don't know how long will one endure this ****************.