What should I do, if police is not admitting complain?

Sir, Presently my family is facing persecution and continue harrassment due to land issue created by a fraudster neighbour who sudden came out after 30 years and has tried to evict my family by making a fake document of my House that is similar paper (Vasgeet Parcha) of my house, where my house is situated since 30 years. In this connection a investigation by respective officers of concerned authority has been carried out and the documents produced by him is found forged and fabricated whose records do not exist legally in the concerned office even according to the ground situation. And my documents and possesion is ok. Over all the entire investigation report by concerned office has also been sent to the district magistrate. The group of miscreants do not believe in court procedures as well as social justice because numerous social meeting took place but they denied, that is why before court verdict once again, they framed another land looting plan by using muscle power to occupy illegally my separate registered land of nearby my house on the basis of same his fake document which is forged and fabricated (Vasgeet Parcha). Now due to 24 hours violence by miscreants the low and order have been created at the place, although they are continue targeting, abusing and attacking to my innocent family (including 88 years asthma patient my father and my old mother). The evidence captured inform of Image and Videos of day to day violence. In this connection I wrote numerous official letter to near police station, district SP, SDM, and DM through my department, but no action have been taken till date. I think the opposition has some approach, that is why no 420 case has been lodged at police station. Now I request you to guide me, what should I do.