Apparently no stock of Sony Xperia Z3

I ordered my Sony Xperia Z3 online 3 weeks ago, they claimed that there was no stock and that it was on a back order. After 2 1/2 weeks of waiting I changed the order to a Samsung Edge which I immediately cancelled within 30 minutes of placing the order as it is more expensive than the Sony and I originally wanted the Sony. Today I went to Vodacom Chatz store in Fourways Mall and to my surprise they have stock, I wanted to proceed with my upgrade and unfortunately I cannot as the previous order has not been cancelled, I phoned Sashin at Vodacom and explained to him the situation and he said he would immediately send another cancellation e mail and it would be cancelled during the course of the day. It has still not been cancelled and I cannot get my upgrade. I am now tired of Vodacom and will be moving my business of - 8 years elsewhere unless I can be guaranteed an upgrade THIS WEEKEND.