Data issues

<p>I bought R29 airtime to buy 100 MB of data...I sent a message on WhatsApp and put my data off.. Now that I put my mobile data back on I saw that my messages weren't being delivered so I checked my data balance & it was zero. This is not the first time it happened to me, the last time it took 200 rand worth of airtime in half a day. I monitor my data & I didn't use any of my social networks today for it to get finished withing 15 minutes.</p>