Procedure and jurisdiction to file case of trespass and threat

Sir, We are tenant for nearly fifty years. Landlord’s men live in the same premises. These people are trying to take possession of the common passage by keeping huge no. of water containers. G.D made with the local police station and also 144(2) Cr.pc filed. Police visited the spot and as soon as they left these people attacked the house. They pelted stones violently one after another aiming at me ,broken window glasses , used slangs and threatened to kill and finally they trespassed a room adjacent to the common passage and have kept their water containers . This room has always under our possession and they could make entry that day because the door of the room was broken for few days. Again G.D is registered. Kindly advise what I should to i) get back the possession of the room and ii) and the legal procedure to be taken for their misdeeds/ unlawful acts and iii) to whom the case needs to be filed.Awaiting you early advice in the matter.