Always out of stock

We were on our on our way back from Johannesburg to Bloemfontein. We went to the kfc drive thru to order something to eat and it was early morning. I wanted a zinger boxmaster and placed to order. They lady came back after 3 mins and said sorry they dont have the zinger only the plain chicken fillet. I said it was fine because I was hunger and still had a few hours to drive. This is not the first time this happend at that specific one. I am just getting fed up with that KFC. They are for some reason always out of stock of something. I want what I asked it paid for!!!