Making companies accountable for their mistakes

I worked for a health care company and at the time of hire they misrepresented my wage and their were other ambiguities with the offer letter. When I became aware of the misrepresentation I followed the channels of communication to rectify the issue and was told they made a numerical error and the issue wasn't rectified. I didn't believe it was fair. I emailed the next person to try to make an appointment to discuss the matter and was terminated because the stated I didn't follow the channels of communication. Due to At Will employment laws I believe other people have, can, and will lose their jobs for situations like this.