Unhappy with cellphone contract upgrade process

I went through to MTN in Ballito on 01 -06-2015 to do an upgrade of my contract, the consultant I spoke to informed me that they had no stock of the Sony Xperia E4 . I leave and return a week later and I am told stock has not yet arrived. I went in again last Friday (26/06/2015) and not only was there still no stock, the lady assisting was quite arrogant towards me.<br> <br> I have the cellphone contract in question with MTN for over 18 years now and another contract for almost 9 years, this is not how such loyal customers should be treated. I had a similar experience when upgrading my other contract in December last year and after making a post about it on hello peter I saw some positive results.<br> <br> Why does MTN advertise these specials when they have no stock? It is really frustrating especially because this is the second time in a 6 month period that this is happening. I never had this issue when Nashua handled my contract. I am really considering switching service providers.