I'm assuming that you're an at-large employee, and that means that you can quit and they can fire you at any time, it also means that they can change your job description, and if you don't like it, you can quit.

legal? yup. sh*tty? yup.

__________________
You have your way. I have my way. As for the right way, the correct way, and the only way, it does not exist.