The Supreme Court has said that coaching centres in residential areas were a nuisance to women and the elderly and must shift out to commercial premises or institutional areas.
A public nuisance is a criminal wrong; it is an act or omission that obstructs, damages, or inconveniences the rights of the community. As per section 268 of the Indian Penal Code, a person is guilty of a public nuisance who does any act or is guilty of an illegal omission which causes any common injury, danger or annoyance to the public or to the people in general who dwell or occupy property in the vicinity, or which must necessarily cause injury, obstruction, danger, or annoyance to persons who may have occasion to use any public right.
As a matter of fact, calling 100 is most effective as, after a visit or two from the police, such nuisance is likely to stop.
Section 425 of IPC which states that whoever with intent to cause, or knowing that he is likely to cause, wrongful loss or damage to the public or to any person, causes the destruction of any property, or any such change in any property or in the situation thereof as destroys or diminishes its value or utility, or affects it injuriously, commits mischief.
That is to stop that person from illegaly using the government property, you can first tell them to stop and if they dont, then you can approach police and file a complain under section 268 and section 425 of The Indian Penal Code 1860.
Reference: Section 268, Section 425 of the Indian Penal Code