Bad upgrade service no stock?

I was offered a great deal on the 9th Aug 2022. My husband did the same upgrade. He received his new package and Sims. I went to an mtn store just to be informed of that my contract was cancelled. I phoned around this morning trying to get hold of MTN. The phone call was dropped 5 times. The people have no manners or customer care. I then spoke to Sanele at Mondo. He was very helpful. But also was informed that the contract was cancelled due to a pro rata amount and my credit. Then he transferred me to another department. I was told a whole different story and must go to an mtn store. Why. Then I received another call. Saying my credit is good. But they have no stock. Really why offering a deal and you can't provide the deal. And it is a sim only upgrade. So after spending 2.5 hours on the phone to this point. Still no great upgrade deal. upg