Yello Trader...... nothing in stock????

I have been trying to upgrade one of my contracts since January 2022. Each time I phone or visit different branches, they do not have stock of the devices advertised in the yello trader. It is March and I am still battling to get a new device. I listed 5 different device options and received no stock responses on all my choices. What is happening to MTN???? Why do you even advertise devices if you do not have stock anywhere in SA?