Unsolicited daily "Purchases" on Cell number

I didn't understand high cellphone bills for month on end. On investigation on statements I saw there was DAILY "Entertainment Services" deductions from 'OnGames', 'Fun Chat' and 'AndroGames' amounting to R16+ per day. Ongoing for a few months now. I dont have games or "chat"apps appart from Whatsapp on my phone. I tried the "Stop" service for Vodacom, but that wont work as these are not 'services'. Tried the call centre, and although very friendly, they only confirm there are no active paid 'services'. Tried explaining to the agent that it's not services but unauthorised 'purchases' that I (and probably he?) can see on my stetement. AS WELL AS ONLINE (http://live.vodacom.co.za/vlive/myaccount/transactionspage). No joy. The only thing I can do to save *R500 a month* is to cancel my current contract (a breach from my side), but I honestly hope Vodacom can do something to protect their customers from phishing attacks like these.