Data gone

<p>Vodacome, please may you explain to me why my data is just disappearig. I am currently using a Samsung A5 that i have been using for the past 2 years, never had any data bundle problem. The past 3 months however, non of my data bundles last me till night time. the only app i am using is whattsapp and i know that does not cost me a lot. i have had to delete all my social mediasites because of my data bundles disappearing but nothing is helping and i still have the same problem!!!!!!!!!!!!!</p> <p>what the hell is going on???</p>