Can't make a call when I need to

<p>Today is the umpteenth time I have tried making calls when I have airtime, and receive a message "you have insufficient airtime to make a call" when dialing *141# clearly shows that I have airtime.. I have ignored it until now, but today, when I need my phone urgently to call in to buy prepaid electricity, I have been messed around and am having my time wasted by MTN.</p> <p>I have tried making 6 calls, between 7:45 and 8am, all greeting me with the same message. This seems to especially be a problem with so-called "loyalty airtime" which I can usually redeem, but when my regular airtime is done, my calls get dropped and I receive the "insufficient airtime" message...</p> <p> </p> <p>This should not be happening at all - what if it was even more of a dire situation than prepaid electricity? Will MTN wait until someone dies for not being able to call an ambulance before this gets fixed?! </p> <p> </p> <p>I am disgusted at this lack of service.</p>