You have the right to be treated fairly at work.
You do not have to stay in your job if your employer is abusing you.
Though your visa status will no longer be valid if you leave your employer, you may be able to change your visa status or employer.
You may make a formal complaint or file a lawsuit against your employer while you are working or after you leave your employer.
If your employer takes action or retaliates against you for doing so, they are violating the law.