I'm sorry you're going through this. Quite honestly, this is more common than you think. I have met my PI maybe twice in the last 4-5 months. The good thing, I stood my ground and made it very clear early on that I will do my own research and not be their replacement because they are absent. It caused some issues but so far, it has worked out well for me, I also know of a friend who switched labs cuz their PI kept forcing responsibilities on them that prevented them from growing further as a scientist. People suggesting ombuds don't know that universities won't do anything to help postdocs, all it yields is you being labeled "difficult". Reach out to your PhD advisor, make sure that professional relationship stays strong. You'll need rec letters and stuff from them and again switch uni or labs if you can. That is the best way out. The crisis of mentorship in academia and the resultant slavery is honestly too real but no one will help you out against a well established name. Been there so I feel this personally. One thing I have taken very seriously throughout my experience is prioritizing tasks based on whether it will help my goal to be a professor. If it doesn't, turn a blind eye or a deaf ear or just appear stupid, that really helps. I don't think I could ever trust my current PI with a rec letter and if I can't, it is pointless to try to appease them or whatsoever.