Have you proof of when it was intially reported to police? Was it formally reported to police? You should be able to obtain this report through freedom of information. Its called CITEC in Qld. Not sure what it is called in other states. If you have proof of when it was intially reported. You can write letters of complaint to the officer in charge of the station where it was reported as well as the Minster for Police in your state. Hopefully, you can get some answers.