I've shared this story before, but for the sake of new people, I will repeat what a high school friend of mine did to a production because people can learn from this.
My friend demands full pay and the script up front to work in a production to do stunts and acting. She got the script and a check for $3,000 for ten days work.
On her first day, she did not like someone on set and quit the production. Every time her phone rings, she is worried the producers are calling looking to get their money back.
I advised her to return the nine days pay she never worked. She won't.
Never pay in full to a cast or crew person because things like this does happen.
When the producer holds back money, you have a way to keep them in line with attendance and lateness.