MTN glitch cost me money.

On 30 April my anytime minutes disapeared. I normally maintain it above 150 minutes so that when the new month start I have 300 minutes. I thought I was ****med and purchased R100 MTN airtime. The next day I checked again if my airtime did not also disappear, but it was still at R100 and my anytime minutes were still at 2 min 53 secs. On the 2nd of May all of a sudden my anytime minutes returned to 187 min. I made contact with MTN and they admitted that they had a technical problem. I requested that they credit my account with the R100 airtime that I purchased as my anytime minutes never gets depleted and I now had to purhase airtime that I would never be able to use. I am a pensioner and R100 is money I can spend better than purhase something that I would not have had to purchase due to my service providers faulty system. After mails, telephone calls, and loads of frustration by making contact with a different call centre agent, the matter is not resolved yet. MTN is *****ing my money because of their technical glitch. I want no favors from them, I simply want them to return my R100 that I am not able to use.