Shocking service - STILL awaiting the device which I signed up for 41 days ago!

Rewardsco called me on the 3rd September informing me that my MTN contract is due an upgrade. I agreed to renew my contract and as I needed a new mobile device I was offered and selected an Iphone XR as part of the contract upgrade. The sales person stated that the device would be delivered between 3 and 10 days. It is now day 41, and I still don't have a phone, nor has anyone had the decency to contact me. I've called NUMEROUS times and sent numerous emails and have not received a satisfactory response. Following a call to Rewardsco and emails between Mondo agent a good 10 days or so ago, the agent said, OH! they don't have stock of that phone! The latest update (via email) is that I must expect an agent to call me... surprise surprise...still waiting. WHAT A JOKE! think you are doing MTN a dis-service to be fair, as if I were to have just gone direct to an MTN branch, I would have had better experience and would have been sorted. This needs to be resolved ASAP.