Commissioner of police

I wanted to make a complaint against garage. As he is delaying in delivery of bike. Police called him and ask to deliver in three day for this he agreed . No response from garage. I made written complaint but police refused to accept. I told this complaint is for refusing to delivervehicle and keeping in his custody . Police refused saying it is civil matter. I write a letter to commissioner. NO REPLY IN MONTH . So filed application under RTI(online) asking for copy of my letter to commissioner with remarks made on it. Again there was no reply under rti for 37 days, I filed appeal. As soon as I filed appeal on 12 June on 4.30pm I got reply on mail on same day at 6.40 pm. Means with delay of 7 days as well as after filing my appeal. Commissner replied that it's not possible to disclose details and as this is civil mater we can't take any action. Can I challenge in court and how?