Incompetant cashiers

I am @ Prominade Mall buying a burger ,not impressed with their service at alll, ibuy a burger for 73 ,99 the one that is displayed at the tills they wrote 43 ,99 on a piece of paper I gave the gentlemen 100 rand note he gave me a change of 26 rands now what is interesting is that the lady who looks like she is foing the books told her to give me double with cheese which i thought she was talking about somebody else but I was the only custommer at the time the burger was done and given to me my question is what will happen to the 30.00 rands when they cash up and how many30.00 rands are they scoring per day and why was they tills off - these are the type of people that are contributing to theft and at this time of the year every company needs everypenny they can get - that is why some businesses dont last it is staff like those two. Its an african lady and a cloured skinny guy both same height.