1. You have the schedule of the land mentioned in your sale deed,
2. Get your property located by conducting a survey through a Govt.Registered Amin,
3. After that lodge a police complaint for illegal trespass in to your land under copy to the local S.P.,
4. File an application u/s156(3) praying for a direction upon the police ro investigate and act based on your complaint,
5. If the police still fail to act, file a Writ Petition before the High Court against police inaction,
6. You can also file an eviction suit against the person who has occupied your land.