All airtime and data gone in one weekend!

<p>I had R450 airtime on Sunday. It's Wednesday morning I have R62. There were no notifications of my data being depleted. I live in and work in wifi zone as well but usually my 1.5GB of data is depleted in about 2 weeks. What's going on! No notifications of depleted data or remaining data amount. This has been happening since October 2016. Countless amounts of airtime and data disappearing then Vodacom will send a "dropped voice calls" message when that's not the issue. I need my airtime and data back. </p>