Please help--Extreme unfair employee treatment, need advice, support?

If the state that you live in is an 'Employment at Will' state then there is probably very little that you can do other than look for another job. What you've just described is how 99% of the retail industry operates. My suggestion is to find another job and hurt them where it hurts the most. Never support their business again and discourage anyone from supporting their business. The bottom line is what a business understands. If you can affect the bottom line, then you will find justice and fairness. For, most states what you've just described is completely legal. Unethical and morally wrong, yes, but completely legal.