airtime and data disappears like water through my hands!

<p>Vodacom please help me understand why everytime i buy airtime it vanishes before i can even make use of it? i bought a R10.00 just to send 1 text message and within 1 second all the airtime was depleted? i then bought another R10.00 2 seconds later and again BAM gone. i then decided to buy a R50.00 just to see what happens and immediately after loading my balance is R38.00 how is this possible? i am spending a ridiculous amount on airtime and data bundles daily. i have closed all browser history tabs and am fairly certain i am not subscribed to any daily services that take airtime. it has become even too costly to make phone calls and i have been reduced to sending whatsapps now. Vodacom please can you work on your charges as your competitors have come up with amazing deals and i really want to move over just because of this.</p>