Missing airtime!!!

<p>I am disappointed with Vodacom, yesterday I had R37 airtime on my phone and some data bundles (I had bought a 1GB data bundle on Friday the 21st). During the week I received an SMS notifying me that I had less than 250MB data and yesterday I received another SMS notifying me that I had now less than 100MB data on my phone, but I did not receive the SMS that I usually receive which notifies me that my data bundles have depleted. As a matter of fact that SMS (which I still do have on my phone) only came through this morning at 12:19AM. So yesterday without knowing I continued to use some social networks and the Internet on my phone as I knew I still had data bundles because I had not yet received a notification SMS, and around 5PM I could no longer send WhatsApp messages and when I checked all my airtime was no longer there. I feel cheated on because I always receive that notification SMS and I usually buy more data bundles or switch off cellular data on my phone after I receive it.</p>