Unexplainable billing

This is the second time in 2 months that I was billed for unexplainable subscriptions for which I never subscribed. When I upgraded from a S4 to a S6, I was informed that there was a R240 subscribtion which I never subscribed for. It was immediately cancelled by the consultant who helped me with the upgrade at the River Square branch in Vereeniging. End September an amount of R909 was debited from my account which included R240 for subscribtions I did not subscribe for. When this R909 was enquired at the Greenstone branch, the consultant could not give me any information regarding this fee and told me that it was unsubscribed for. That is unacceptable service and I would like to know how I SUBSCRIBED TO THESE SERVICES AND WHAT IT WAS FOR????? THIS IS NOW ALMOST R500 FOR SERVICES THAT I NEVER USED OR SUBSCRIBED FOR AND CAN NOT BE EXPLAINED BY VODACOM. I also never received any bills for Aug or Sep. This is unacceptable service and billing from Vodacom!!!