Thanks. the problem is that the bullying is coming from my supervisor :(. Repeated attempts to talk at a level above this person has just simply not worked.

My best advice on this is to face it head on. You don't have much detail here so it is hard to go into specifics, but I would talk to your supervisor and ask them what is leading to this treatment? Did they hear something? Can they tell you what is was? Then you can offer to provide your side of the story