Qiqihar mayor hotline

Hello, mayor, my house lease expires on April 1. I went to have a look. The renter took my bedside, bedplate, mattress, mirror and spoon. Don't answer the phone. I reported the case, and the police station said it was out of their control. Let me sue, not stealing. I don't understand, it can be said that they can solve things by checking online and making a phone call (I have the tenant's ID card and phone number), so why should they go to court? I thought the people's police were for the people.