Work feels toxic right now. You're tired of being subjected to a colleague's abuse. It's important to file complaints to establish a paper trail. If nothing is done to address the problem, you should look for another position. In the meantime, you may be able to voice your issues. Don't allow this injustice to continue any longer. As soon as you get some distance from your job, you'll realise how deeply dysfunctional your workplace has become. Turn your back on the darkness and run towards the light.