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 R120 at the end of this month...I'm not at ALL happy!<br> <br> Take not that I did have Data and Mobile Data that's how I know it's not on my side<br> <br> I've even got the messages to prove it