DATA LIMIT VANISHES!!

Last month on the 16th Feb I had a data limit of 156MB left. When I got my new allowance my balance was deleted - nothing got accrued. I phoned MTN and they said they will look into the matter. STILL WAITING. Since that day I have been faithfully checking my data usage 3 times a day. This morning at 10am I still had 121MB of data. When I checked a few minutes ago, I had nil data available. I also received an SMS. I phoned MTN and Kgaugelo in Customer Care informed me that there is an IT related problem on their side, as many people received this message. I was informed to switch my mobile data off as any costs for data would be for my expense. I am being punished for an MTN problem. I need my data as this is how I communicate with my son. This is totally unacceptable as I am not at fault, I still have 121MB of Data. When asking to speak to a supervisor, (already on the phone for 29minutes), I was blatantly cut. Why I am being punished for an error on your side. What if this happened on the 18th of a month, where my data went missing?? Would I then have to wait until the 17th of the next month to get my new data? I need this matter to be resolved.