file police complaint against neighbour for criminal trespass under section 441 of IPC
2) Section 441 of Indian Penal Code, 1860 which defines ‘criminal trespass’ as ‘Whoever enters into or upon property in possession of another with intent to commit an offence or to intimidate, insult or annoy any person in possession of such property, or having lawfully entered and unlawfully remains there
3) you can also move civil court and seek court orders for removal of the encroachment on your property and injunction restraining them disturbing your possession of land