Balance Check is wrong

I was doing a lot of phoning this last month (August 2015), <br> I checked my Balance every so often and it said I still had 23.45 talking Minutes left.<br> Knowing that I had available minutes I didn't hesitate to make phonecalls, <br> Now I have to pay an extra R154 at the end of this month<br> <br> Take not that I did have Data and Midnight Data that's how I know it's not on my side<br> Mpho did contact me about it but I'm waiting for a update<br> <br> I've even got the messages to prove it<br> Example:<br> <br> 21/08/2015 11:30<br> <br> Available Minutes : 23.45<br> Data : 40.82 MB<br> Midnight Data : 65.46 MB<br> Current Usage : R30.31 ????? How? (No SMS's were sent)<br> <br> 21/08/2015 23:21<br> <br> Available Minutes : 23.45<br> Data : 35.08 MB<br> Midnight Data : 65.46 MB<br> Current Usage : R46.16 ????? How? (No SMS's were sent)<br> <br> My most recent Statement I have pulled up today says I owe an extra<br> R154.12 for August<br> <br>