I had an issue with the store manager at my place. A District Manager who took it upon herself to hate me turned the manager against me.
I reported the pair of them for bullying to our bullying line, and it was treated very seriously.
The manager now is very pally with me and bends over backwards for me, but the District Manager is still a bitch. I keep the Three D's Of RHU close at hand.
Fortunately, as long as you stick to facts when reporting, they can't do much.