Can someone please help me? One of my coworker is harassing me (name calling ,snarky comments etc) when no-one is around .It's an ongoing issue the least more than 3 months and HR won't do anything because "there are no witnesses ".I don't know anymore what to do but the situation is really bad . Of course the coworker denies any wrongdoing and saying I'm the one who is a bully -I've never reacted to her abuse always walked away and let the management know about the situation every time when it's happened . I don't know what else I can do apart from emailing to the HR .(I'm working in retail)