Cellphone contract renewal

I was contacted on 1 November by MTN on ********** 610. They were offering assistance with the upgrading of my contract. I went through the the process and ordered the Iphone 7 which I was told would be delivered in 7-14 working days. I was told that if there were any problems with the order, that I would be contacted by the next Monday. 12 days came and went and eventually we were contacted by Nosi who told me that the 7 was out of stock. I went ahead and then ordered the Iphone 8 as there was stock available. I was again told that it would take 7-14 working days. I told Nosi that I was already waiting since 1 November and she arranged that delivery could be completed by Friday, 24. I told her that I was out of town on that day and would not be able to take delivery then. She said to wait until the courier calls me and they would make arrangements. They then called me on the Friday as they wanted to deliver the phone but like i said I was out of town. I was also in meetings and I asked them to call me back at 13h00. They never called back. I then called them on Monday morning to ask if my phone would be delivered. They said that there truck is full and would only deliver by Thursday. I said this was not acceptable and that I've been waiting since 1 November and it was 27 November by then. They said it could be delivered faster but that the instruction needed to come from Nosi. I called Nosi to let her know this and she said she would call them and then they would call me back. I waited and no call came through. I called Nosi several times to let her know that i still hadn't heard back from the courier company and each time she promised she would call them. I then called again this morning as hadn't heard back from either the courier or Nosi and she then promised to sort it out. An hour later, the courier called me to say that they would now be delivering the phone on Friday. I was furious because now it was delayed an extra day. I called Nosi while they were on the phone with me and was told that she wasn't at work which was ridiculous as I'd spoken to her earlier on her work number. I then asked to speak to a supervisor, whose name is Mani. I explained to her what was happening because by then the story had changed to Nosi is on lunch at 11h15. She flat out refused to send the instruction to the courier for the delivery of my call and said it would arrive when it arrives. I tried calling the courier company again and was on hold for 30mins before my call was answered and then cut off. I called back and was on hold for 15 mins before someone answered. This lady then said the phone would be delivered by Monday. So each time I call to find out what is happening, the delivery gets pushed back by another day. My debit order is coming off on Friday, MTN congratulated me last week Wednesday via sms on my upgrade and new handset, yet I am yet to receive this phantom phone. And of course now, Nosi's line just rings ( ********** 610) and then cuts out. This last lady from DSV was actually helpful and promised to follow up on this delivery and said she'd get a manager to call me back about this issue. At this point, I still have no phone and no faith that i'm receiving it any time soon.