Vodafone India — 3g data exhausted within few minutes

I am living in a ahmadabad. I am facing some strange issue.. Purchased 3g data pack twice in a day and both got exhausted within a few minutes. How that possible when i have not used data that much.. I am using mobile data with my laptop so i know how much data is consumed with every applications. When called customer care they don't have any idea about this issue.