Incorrect Order

I am Downright Disappointed in Rocomamas and Mr D delivery. I ordered a double beef Rockstar burger and as I was about to eat it, I realized that they had gotten my order incorrect, entirely. I was given a chicken burger with just mayo sauce...how outrageous. I am very sure that I must have paid more than I should have in terms of what I received. I still await a response from Mr D. Please let me know what I can do about this truly UNFORTUNATE situation.