R129.99 special went away after a web page reload.

So i was ordering (online) the any 2 large pizza's for R129.99 special and just when I wanted to check out & pay when the web page reloaded. When that happened there was nothing in my cart so I had to re-do everything. So when i went back into the specials menu which made no sense because it was just there then I called to find out what is happening just to find out that the special is no more [NOTE: this was just after 14:30 today] so now I am really upset with this because the special in a matter of a web page refresh. I mean WHY??