not being paid properly, or not being paid at all; OR
not being paid for working late at night or on weekends (penalty rates); OR
not being paid for entitlements such as annual leave, sick leave, long service leave or redundancy pay.
You have the legal right to recover what you are owed.
What you need to do:
Step 1. Work out exactly how much you are owed Step 2. Raise the issue with your employer Step 3. Write a letter of demand Step 4. Make a complaint to the Fair Work Ombudsman; and/or Step 5. Make a claim at court.