Contract Upgrade

I was informed by sms from Mtn that I was due for an upgrade. The new specials booklet is only released on the 8th of the month. On seeing the phone that I would like to try next, I contacted an Mtn shop in Centurion who advise me that they do not have stock in the shop but would order. This would take a week. After a week, no response. I then contacted another shop in Centurion with the same response. After a week, still no response.<br> So no response from the shops and friends have informed me that I will not get any response if I order via the Mtn website. I have been with Mtn for more than 15 years now, so how do I proceed? Do I take my number and go to Vodacom or Cell C?