1. This matter can be solved by civil court alone, because the police cannot go beyond certain extent, hence the court only can pass an order after analysing all the document sand hearing both the sides.
2. Since this is an unapproved layout, the surveyor may not have any records to verify the correctness of the plotted property.
3. What is regularisation, if that is the case from where the stranger is claiming his ownership in the property, he has to establish his title through court of law.
4. The regularisation is a different subject to that of the title claimed by a stranger in your purchased property.
You have to first establish your title while a third person is also claiming his title to the property you have purchased.
5. You can proceed.
6. What are you going to with the claim made by a rival claimant with the property documents in his name.
7. By filing a declaration suit to declare the title on the basis of the registered documents in your name, let them discharge their burden to prove their title.
8. You can fight it out in court of law.