I have had to deal with this in the workplace; bullies for coworkers and bosses in a highly toxic workplace. I used a few spells I posted below:
They worked very well for me. Maybe there is something in there that could help or inspire you.
You mentioned not having luck with entities, but I figured I’d mention that Belial, King Paimon, Glasysa-Labolas, and Flauros have been instrumental in my work to remove shitty people from places of power.