Upgraded 7/7/2015 - still waiting

On 7/7/2015 I upgraded my cell phone as my contract had expired - I phoned in to do so. The phone I wanted is a Nokia Lumia 640 and I was told they presently had no stock, and I would have to wait about 2 weeks. Well, this is 2 months later, and in spite of many phone calls and enquiries, Vodacom is still out of stock. During one of my query phone calls, I was offered alternative phones, but both models I was offered would have been a downgrade not an upgrade. I want the Nokia Lumia 640 with its full functionality. One good point is that they have given me free BIS for my Blackberry while I wait - at least it is supposed to be free. I can't check because the Statement and itemized invoices I am supposed to receive on a monthly basis somehow do not arrive. I changed my email to which they were going from a gmail address to my business address. I received the Statement 1 month and nothing thereafter. I am so fed up but really do not know what to do at this stage.