Wrong Contract Processed by iStore Sandton

I went to the iStore in Sandton to take up a contract for the iPhone 6 on the 29th of December 2015, while there a lady name Lerato took my details down.I then specifically told her that I wanted the 64 gig iPhone 6 which we agreed on that day from which she advised that processing of my contract will take 24 to 48 hours,she also advised me that I would get a call back from her confirming when I should come and pick up/fetch the phone.The 24 to 48 hours did pass without that call back and I opted to rather fetch the phone on Monday(04/01/2016) as I hadn't received a call back from Lerato or the iStore staff.Upon my arrival on Monday I was told that Lerato was sick and that my Phone was ready.When the phone was handed to me I noticed that it was a 16 gig and wasn't the 64 gig I had requested initially.I was then told that the wrong contract was processed and I had to wait a month for the correct to be processed. I Then received an SMS from Tyler Klink stating that would debited this month for a phone that I don't even have,to also note that Tyler did not even apologize for the mishap that had taken place.I feel this is unfair and not my fault why I was paying for Phone I don't have.