Non delivery and unkept promises

I was contacted around 8am on Friday 11 March for a handset upgrade, and accepted the upgrade offer from MTN direct sales. I was promised delivery the same day 11 March. No device was delivered, nor was I contacted in any way as to say what the delay was.<br> On Saturday 12 March I went into an MTN store to find out what was going on and what the delay was, only to be told that they could not assist me as MTN direct is a different division and that they do not work on weekends.<br> Today I contacted Mtn at 0845 , 10h30 as well as 13h00 , to cancel my upgrade. Only to be told every time that I will phoned back. I would rather go in store and purchase my device direct , without the empty promises from the telephonic sales department, whom never phones back.<br> This is the worst service ever, and I feel like cancelling both my contracts with MTN.