Plz. reply urgently

I HAVE PURCHASE ONE PROPERTY 3 YEARS BACK. PREVIOUS OWNER HAS GIVEN TITLE CLEAR ADVERTISEMENT IN NEWSPAPER. NO OBJECTION WAS RECEIVED AND TITLE CLEAR CERTIFICATE WAS ISSUED AND I GOT SALE DEED REGISTERED IN MY FAVOR. NOW I RECEIVED A CALL FROM POLICE STATION THAT ONE THIRD PARTY HAS FILED AN APPLICATION FOR COMPLAINT THAT PREVIOUS OWNER HAS ENTERED INTO AGREEMENT TO SELL ON RS 100 STAMP PAPER AND WHICH WAS LATER ON CANCELLED. BUT THIS THIRD PARTY WHICH IS NOT KNOWN TO ME HAS PUT AN ALLEGATION THAT PREVIOUS OWNER HAS NOT GIVEN MONEY TO HIM AGAINST CANCELLATION OF AGREEMENT. THIS APPLICATION WAS GIVEN 6 MONTHS BACK TO POLICE BUT POLICE HAS DONE NOTHING AND NOW THIS THIRD HAS GOT AN ORDER FROM HIGH COURT WHICH DIRECTS THE POLICE TO SEE HIS COMPLAINT WHETHER ANY COGNIZANCE CAN BE TAKEN ON THIS COMPLAINT. IF NOT, THIRD PARTY SHOULD BE INFORMED IN WRITING. NOW POLICE IS TELLING TO RECORD MY STATEMENT AND HE IS THREATENING ME TO RECORD THE STATEMENT AS THEY SAY. FIR IS NOT REGISTERED TILL DATE. I DON'T KNOW THIS THIRD PARTY, I HAVE NOTHING TO DO. WHAT LEGAL ACTION I CAN TAKE.