Still waiting for Airtime & SMS' to be given back

I am still waiting for MTN to sort out this issue!!!!!<br> <br> On the 25th November i posted this: \I recently changed my contract (September).<br> The week before last i noticed that approximately R2000 in airtime (that i paid for) & a few thousand sms' (that i also paid for) have been taken off my account. They are gone. <br> I request that you return both the airtime and sms' to me asap. I paid for those items &you have no right to just remove them. I have lodged 3 queries on your system. The 1st one just vanished. The 2nd one lodged on the 19th Nov ref