Sorry to hear about your work environment. The relationships at work often involve conflict of interests. For example, fighting for promotion, bosses want to spend the least money and squeeze out most results, employees want to make most money and do least work. So bullying and stabbing each other in the back is common. Sometimes you can collect evidences to protect your rights, sometimes you can't. It's all part of this so-called office politics.
A friend of mine trained an intern, taught the intern a bunch of things, then the intern became a full time employee, framed my friend, my friend got fired. She then got a new job and the corporate culture is so much better. She said the worst thing in her life turned out to be the best thing.