Bad Customer Service from Call Centre

I did an upgrade on 11/11 and was told that my phone would be delivered to me on 13/11. I tried several times to get a hold of the lady that assisted me to no avail. Every person I spoke to at the call centre gave me a different story. I eventually got the tracking number and phoned RTT who told me that the phone will only be delivered on Monday 16/11. I phoned RTT this morning to find out what time I can expect delivery and they informed me that they do not have authorisation to send out the phone today. I phoned MTN call centre again and still no one could give me any information. A message was left for the call centre manager to call me on 13/11 and till now no one called me back. I'm leaving the country and I need the cell phone ASAP. If the phone is not delivered by COB today then I'll be cancelling my contract. Your Customer Service definitely is the worst in the industry.