Airtime Dissapeared

<p>Good day</p> <p> </p> <p>On Tuesday i bought my mother airtime for (R5, R15, R30) amounting int total to R50.00. She recharged all 3 vouchers and airtime loaded succsessfully. She then made a phone call and suddenly the call gets cut off( wondering as the call didnt take long) checks her balance and she is left with 45.00 Mb which is reserved for data (she cant make a call as it says insufficient airtime)... Firstly, why should MTN determine for us which amount shoud be for artime and which one for data?????/ This is just not right. We then used R15.00 from the R45.00 to buy 100 Mb data and the rest of the airtime dissapeared. R30 that was supposed to be left had now dissapeared. She now had R3.50 airtime. How is that? where did the rest of the money go. We contacted 173 and twice we got cut off, tried again and we went through, we told that there are apps running which is the reason the airtime got used up and she had a remainder of R3.50. My mom doesnt even have Facebook, twitter, or any social accounts, which apps can possibly use up all her data. I dont understand why MTN has to make money out of us like that. This is not the first time such has happened.</p>