Illegal occupation of my property by a police officer.

Hello Team, I am really upset with the illegal occupation of my property situated in Ghaziabad, UP. A police officer of UP police has been illegal living in our house in Ghaziabad without rent and is not vacating our house despite telling him thousands of times. He is harassing us, not taking our calls and not paying us. We entered in an agreement with a man called Rajesh in May'2018 for letting our house on rent but we came to know after a few months that Rajesh has never lived in our house and a police officer has been illegally living in our property with our consent. On questioning the property dealer he told us he defrauded us for giving this house to a police officer because nobody gives house on rent to a police officer. Now the police officer is not leaving our house and he is threatening us that he will not leave this house. First of all he defrauded us and now he is harassing my family and not leaving my house. What can I do in this situation? We complained in the police as well but they are not helping us rather asking us to go to the court saying it is a civil case. This is a clear case of fraud.