No Stocks & Poor Customer Service & Attitude

I went to get a portable aircon unit that is currently on special, naturally the store did not have stock of the item and claimed either it was sold out or they did not receive it. How do you not have stock of items on special, especially if you can see the demand / high sales on various regions?? I asked for further assistance to see if we could track some stock / find which stores have stock. A cashier called for \Stephen"who was a few tellers away. He acknowledged the cashiers call"