Unlawful occupation of property

I would like to bring your urgent attention on unlawful occupation by my elder brother Sri Nabajit Dutta He made encroachment /illegally enters the property that belong to me and remain there illegitimately causing considerable problems to me .He is dubious & disreputable characters ,trespassing /infringing my property without seeking my permission . When I requested him to vacate my properties he threatened us with dire consequences. I suspect ,he is involved in illegal activities & It had caused risked to my asset/ property of the undersigned being the land owner bearing Patta No 1249 Dag No 1141 , Revenue Village No 1 Maidam , Mouza Belotola , Guwahati located in address House No 23 , Ward 58, Banipur Path, Sankar Nagar (Copy of sample NOC for construction of RCC building & Land patta attached herewith) It needs to inform that I am an employee of Indian Oil Corporation and presently, I am staying at Noida Sector -55 on account of my service exigency being posted at R&D Centre, Indian Oil Corporation Ltd. As presently most of our family members are away viz. aged mother Mrs Purnima Dutta Retd. Headmistress (M-[deleted]) and 2nd elder brother Prasenjit Dutta(M-[deleted]) Asst. Executive Engineer PHE stays at N. Lakhimpur, 3rd elder brother Dibyojit Dutta (M- [deleted]) and myself are staying at Delhi NCR, it is getting difficult for me to manage these antisocial activities & encroachment of my properties at Guwahati. I would be highly obliged if you kindly take a look into the matter and take some appropriate measures to curb this problem to prevent unlawful activities of the antisocial element Nbajit Dutta to debar them from entering in to my property who have illegally trespassed and are trying to grab my above-described land and building/flats