False adverti*****t

I ordered online the triple deck special on 23 December and it showed I will receive 1.5 COKE with it. Mall of Africa debonairs accepted my order and when I went to collect I was told the special is finished. I only received my pizza. I ordered again same thing on the App on 08 January, same issue. I feel it's false adverti*****t and again why didn't they call me before making the order and advise me so that I can cancel my order?