Can not solve there mistake

I want to get an iPhone 6 by mtn. I did phone them so that the phone could be delivered to me as I did not have time to go to the shop. I went through the process and then I was told they do not have stock. I was advised to go to a store where I had to do the process again. Which I did not mind as I wanted my iPhone. The people then did not cansel my first application and the number activated and my Vodacom number is no longer working. After months of trying to get this problem resolved I am getting no where and no one can help me. This is really poor service and I still can not get my old number to work and still don't have my iPhone.