Unacceptable service from MTN!!

I am so livid with MTN! We got a call early December, my husband spoke with a consultant who contacted us to upgrade our phones. My husband told him what we wanted (iPhone 11) and the consultant asked for the colour (space grey) and all was confirmed, with delivering being promised within 3-10 working days from the date of the call. I phoned yesterday and was told that there is no stock of the device yet it was confirmed that there was stock when the call was made to us and the second consultant on the phone could not tell me when stock would be replenished. Please can someone contact me regarding this, because I find this pathetic service - YOU call ME to upgrade our phones but yet you can’t deliver the service or the device yet we are paying for something we don’t have???? Now I cannot believe any of your consultants when they call !!!!