Never have stock when upgrading

Ive been a customer of Vodacom for the last 16 years and every time I upgrade I have to settle for another phone due to NO STOCK.<br> <br> This year the same.When I phoned to find out what is happening with my upgrade I was told I can take another phone or have to wait - but no time limit can be given?<br> <br> This is unacceptable. How do you advertise something you dont have and can not give any answers on the product.<br> <br> I want my upgrade phone or some sort of answer as to when I can expect it. If not I will have no other option but to cancel my service with Vodacom and go to another service provider.