Lore: I am experiencing difficulties working with my line manager. He's involving me in useless meetings, he feels threatened by my presence after lying about his own expertise and he's trying hard to make sure that I work in isolation, so that he can intercept all my communications and make himself a part of the creative process.
My boss already got demoted once just before I joined the company. He previously made a favour to the husband of his current line manager, and this person is protecting him despite the demotion and several hr reports, including discussing a new hire salary in front of his future colleagues.
Problem: I would like to get help from my manager's manager, but she will support him by default. Above her, there is a C-level manager and he will just tell me to buzz off.
Question: how can I get help with a line manager when there is no hope in his own line?