MTN didn't send new handset after upgrade

I upgraded my sky contract on the 1st of December. I still have not received my two new handsets (I was promised 3 to 5 days). I have phoned multiple times to be told that the phones are in the warehouse, then the phones are at the couriers. I called the couriers and they have not received anything. The last time I called, the agent told me that there is no stock of the S20 and I will wait till mid January. My complaints are: *I specifically got the agent to check availability when I chose the S20 (I had already shifted from another handset that was out of stock) *Why did it take MULTIPLE phone calls before I was told the truth - that they are out of stock. Not bumping me to and fro between MTN and the couriers. *Why was I not contacted when the S20 was found to be unavailable and offered another handset? *This complaint has been escalated and I was promised that a manager as well as the agent who initially helped me with the upgrade would contact me today. This has ALSO NOT HAPPENED. *What do I have to do to get ANY decent service here? I have been an MTN client for over 20 years but will very soon be moving to vodacom if this is not sorted out TODAY.