Data disappearing

It seems I am not the only person experiencing this problem. I have purchased R110 in the last 2 days and converted it into data, and this data has been sucked dry by a grand total of 8 whatsapp messages. Phone has not updated or downloaded anything, as confirmed by iStore who double checked that my phone was set to only update when wifi is active. So i was directed to Vodacom, who had no soloution besides 'delete your apps' which can NOT be the issue as even the manufacturer of the phone confirmed that the apps were not the issue. I dont want to buy a cent more airtime for fear of it being wisped away immediately. Now i am either forced to switch service providers for fear of data theft, in which case i will be forced to pay out my remaining contract?! What are you going to do to resolve this Vodacom????