Vodacom please help

I upgraded my contract at a Vodacom store in Feb and was given a second sim card with R110 free airtime each month as part of the promo at the time. I have now been charged for the R110 airtime for the past 2 months. Over and above this vodacom are charging me for some Vodafone live service which I never subscribed to or signed up for. I have never used this service yet I have been charged approx. R60 for February and R130 for March. This is theft and unnacceptable. Vodacom I have been a loyal customer for over 15 years. Please resolve this and refund me. If not reolved soon I will be forced to stop the debit order with my bank as this is against my contract and not what I signed up for.