Frequent phone calls from police

Hi Sir... 1. I bought a house for which the owner bought it 30 years ago from some X person only with 2 link documents; very clear. 2. The said house plot is just beside the buyer's own house and to the other side there are persons who trespassed, creating interferences for which I gave complaint 3 times in the nearest PS, but they did not register any FIR; then I approached court and filed a private complaint for which police registered an FIR against the persons who are interfering. 3. Now the problem/question is police are frequently calling me on phone for enquiry and I went to the PS and provided what all they needed and explained every thing. Police there tried to brain wash me stating that change my advocate stating that he did not prepare the private complaint properly (this is confusing to me). 4. Feeling something fishy, I gave a letter/complaint to the CP. CP sent a letter to the PS asking to verify and do needful to the Police; 5. Police now are calling again and again stating that I have to come with a four wheeler/car and take the police to the disputed location, etc. My question, is even after myself providing all details to the police, do I need to arrange a car and take them to the disputed location and also they are asking to meet the person who initially sold the land to my owner from whom I purchased the disputed house plot. Kindly clarify Thanks in advance DK