I once worked (in personnel and as a supervisor for field operations) for an employer who totally ignored the statutory requirements for hours of work and overtime. Anyone who was newly hired or was quitting had to deal with me. My invariable advice to all employees was to keep records of where and when they worked as well as what they were being paid AND to take those records to the government agency tasked with ensuring compliance with the labor laws as soon as they left the employ of the company I was working for.
The company had a standard form response to inquiries by that agency and that response ran along the lines of
Pursuant to your letter of _______________ we have checked our records and have discovered that there were payroll errors with respect to the wages paid to __________________. On recalculating what ______________ should have received we determined that they are entitled to an additional $____________, as outlined in your letter, and enclose our cheque in that amount herewith.
The company ALWAYS paid up in full - PROVIDED that the person actually got off their butt and made a formal complaint.
For some reason the government agency never figured out that the company always knew that it was in violation of the labor laws and all complaints the agency received were always closed out as "Successfully Resolved" (which meant that the case worker's track records looked really good).
No one ever figured out that the company was (in essence) taking interest free loans from its employees.