Denial of salary worked for and unfair treatment on workplace

I worked at studio88 before being dismissed with immediate effect as a 'new casual' who helped to also find culprits who were *****ing from the store and never even got any form of recognition for being a good new employee to the shop. I was not paid my last week's salary and when I called Jason and Gavin who are the upper managers of the stores I was given attitude and told that they're still busy with somethings more important than my issue. Now this is my money that we're talking about here money that I worked for and being refused to be paid. When it comes to the treatment of employees the service is **** as we're being treated like garbage and a liability when us the Frontline worked of the shops are the ones who make sure the money comes flowing in with lots of hours worked and only a little salary as well as unfair working conditions as there is no specific work assigned to a particular person we have to do everything to make sure that the store runs smoothly and all that we get back is serious and personal swearing from the people in charge. We as employees who were unfairly treated or dismissed in factory stores about to act on that cause we've had enough with the company. I just want my money that I worked for that's all