What should I do at work?

I work at a pizza place and you know a lot of kids eat pizza well I walked out of work the other night because our night time manager put the old fallen cheese of that shift in the container with the fresh cheese for us to use on the pizza not only did it have other food pieces from the toppings that had fallen on it we use anchovies and I had some juice fall on the cheese so I wasn’t comfortable using it not to mention they have sold good that has fallen on the floor meatballs with mold on it an making jokes about it and dough with hair stuck to it my question is what should I do about it?