Exorbitant data bills

Vodacom has deducted an extra R1200 off my account this month and plan to deduct another extra R1800 next month for supposed data usage on my ipad AIr. <br> 1. This device has not exceeded its 2GB limit since i have owned it, and i am firstly surprised that it has wracked up this kind of bill for the last two months. I have used it in no different way. So firstly i need to understand what exactly the data usage is for...<br> 2. i am supposed to receive notifications when any of my devices are reaching their 2GB limit - but i received no notification for either month. This is unacceptable and not what i have agreed to with vodacom.<br> 3. I understand the data has been used, on what no one really knows, and i am prepared to pay for it on inbundle rates only.<br> 4. I expect a refund of the excess deducted off my account this month, and for the account for July to be adjusted as well to inbundle rates.<br> 5. I want confirmation that i will definitely receive all notifications for exceeding bundle to my primary number *** as stipulated.<br> 6. ideally i want all my devices to have their data capped at the 2GB contract limit. <br> This is not the first time this has happened with vodacom.