Your Mother sounds like a crook. What she's doing is incredibly sneaky and underhanded. Not only is she illegally withholding your pay and screwing up your credit, she's lying to you about it and expecting you to work overtime? No offense, but f*** her. I'd politely tell her that you are aware of what she's doing based on your conversations with other employees and that until you are paid what you are owed that you will not be coming in to work, let alone working overtime. It isn't even like you're contributing to a family business you have stake in, you are an employee and she is actively taking advantage of you and screwing you out of money. Family is family, but she obviously cares more about her business than about treating you fairly, so I wouldn't be doing a damn thing for her until she pays you.