MTN, please pay back my money!!!

On 25/08/2015 I bought R175 MTN prepaid airtime through internet banking. Today, almost 4 days later the purchased airtime is not reflecting and not available for my use. I have called MTN many times and they say they can see the payment but a technical glitch is delaying the release of the airtime for my use. I was advised to wait a few hours, remove cell battery and restart phone, send proof of payment, etc and still MTN is not honouring my payment and not informing me what is going on. I spoke to a Siyabonga Zulu from MTN who promised to resolve if I send proof of payment