I ordered 7 fully loaded box meal's/21p bucket

I placed my order for 7 fully loaded box meal's and a 21 piece bucket/ on paying I realized that I was over charged, I requested an explanation and was told that there wasn't any stock for the drinks that came with the meals so therefore I had to pay extra for 500ml cokes that they where putting in the boxes instead of what was advertised, with the 21 piece bucket I was only given wings and breasts and when I asked for other chicken I was told there isn't any stock and I must take it or leave it, I also wanted to order 7 burgers and was told there isn't any burger buns, I was so angry that the \manager"was so rude and telling me I must go buy else where if I don't like \""his\"" shop"