PnP Westonaria advertised a fresh vegetable combo, when we got there they did not have most of the vegetables in the combo (5 items for R100) as advertised

PnP Westonaria advertised a fresh vegetable combo, when we got there they did not have most of the vegetables in the combo (5 items for R100) as advertised. This was only valid for today and after enquiring about we were told that they couldn't get all the vegetables as advertised. Why advertise if you do not have the stock on hand?