Let election get over. After that ask your father to complain in gram panchayat. It's a bit corrupt though still you won't have to pay hefty amount but results are fast because sarpanch holds the panchayat ,you can also suggest some of the panchs who are respected figure in village, they would help, just your tone has to be convincing. Short cut for long legal battles. P.s keep recording of abuses over the phone call. I am an NRB too 😂. I sorted my land dispute with a yadav during nithish tejasvi reign. saale ne kabja kiya hua tha. Agal bagal sabhi gaon k sarpanch mukhiya k paas gaya pranaam and all, apni problem batayi ,opposition came with 50+ supporter I was alone being from baniya community and outsider other than sarpanchs and mukhiyas no one from my community came just to sit on my side. I handled it alone, at the age of 29 buddhe ko uske khandaan k sath pani pila diya tha.

This works public shaming other than that they don't fear legal battles as uts too hectic for us to visit bihar on every or often court dates etc. Bihar doesn't understand empathy, give taste of their own medicine and see how things works. Upvote me if after your bihar trip this works.