Refused to give me my burger that I bought

On the 25-12-2015 01:47 I bought 2 meals of burgers. When they gave to me I did not check immediately. All to find I was given only one burger I only saw at home. I couldn't go back the same time. I went today to claim my burger Tatenda(manager) refused to give it to me. I asked him to check the footage to see if what I was given and I also showed him my till slip but still refused.