Out of stock and unreasonable timelines

I placed my order for an iPhone 6s rose gold 64gig on 13 December 2015 at the Vodacom shop. Avery Figg was the Sales Consultant who assisted me. He advised me that the store was out of stock of this specific phone but told me that the new stock would arrive in a week i.e. plus minus 20 December. I called the store on 22 December to enquire when the phone will be arriving as I have not heard anything as yet and the lady (I do not recall the Sales Consultants name) advised me that the new stock is delayed in delivery but should arrive by 24 December. Fast forward to 6 January 2016 and I have yet to hear anything from the Vodacom Shop therefore I decided to go into Canal Walk to enquire in person and I was advised that Vodacom still does not have stock of this specific phone and cannot advise when it will be arriving. I find this unacceptable from a leading cellphone provider.