Upgrade in limbo - HELP!

I upgraded online through the MTN website on 28 Nov. I still have not received my device. When I called in Dec I was told the upgrade was with a third party as MTN have outsourced their upgrades. To date this third party has told me there is no stock and they are waiting for MTN. I have tried for roughly 3 hrs today to speak to some one at MTN about their stock. I get put on hold, transferred, given other numbers to call and eventually disconnected. Every number I call is the wrong department. No one can help. All I want is a clear answer! I would cancel my contract if the other providers were any good.