10Gb of Data used when i wasn't online?!

<p>Mobile Sim Number: ********** 898</p> <p>2 days ago (June 9th) I purchased a 10Gb mobile data bundle from Vodacom using FNB. By today 11th it was used up, although confused as a 10Gb bundle lasts me 3 weeks, I purchased another at 12pm today ****h June), by 9pm it was used up having watched only 2 episodes of series. No one has the password to my device and I am the only user. How could this happen? I am disputing this and expect a refund from Vodacom or at least the reinstatement of a 10Gb mobile data bundle. This is outrageous!</p>