Bad attitude and no form of customer service

On the 21st of April I bought data bundles , it was 1gig and MTN has a promotion where they give you an extra 1gig for free. My problem is that yesterday morning (5th May 2015) I had about 700MB left and later on when I tried to surf the net there was nothing left (I had no data left)... So today morning (6th May 2015) I tried calling the Mtn customer care line 173 and An agent who was on the line wasn't helful at all, she was too rude and wanted me to listen to her while I was still explaining my situation to her and on top of that she had an audacity to give me a false name. she said her name was Molebogeng and didn't wanna provide me with her surname. Her supervisor called Maria Swartland called me and said \Molebogeng's"real name is Relebogile Ngcobo...She has a bad attitude and no form of customer service in her at all. I've buy these data bundles every month and this is the first time that my data just decided to disappear"