MTN *****ing airtime

<p>I upgraded my mtn contract fone and at that time i was using Nokia those R200 fones. I receive over R1000 airtime every month from work. And when i changed my phone on Friday 1 July 2016. At that moment i had R1020 airtime. Due to their long process on upgrades. I got the phone Sony Experia Z 5 at around 10h00 and had quiet a few upgrades and when i got to the office around 12h00 and checked the balance it was now R95. And when i keep calling the call centre, they give me run arounds. I've called them over 3 times now and there is no solution or clear explanation on that. They keep on telling me that they are investigating since the first of July </p>