It may be legally possible to bring about a private prosecution of a criminal offence in Tasmania.
Not sure if this act is still valid:
Criminal Code Act 1924 (No. 69 of 1924)
Quote:
420. Private prosecutions
(1) Any person may, by leave of the Supreme Court, file an indictment against any other person for any crime alleged to have been committed by such other person.
(2) Leave to file any such indictment shall be granted upon such terms and conditions as the said Court in any case for the purpose of securing the substantial ends of justice thinks fit to direct.
(3) Every such indictment shall be endorsed with the words "Filed by leave of the Supreme Court of Tasmania", and with the name of the person prosecuting the same.
Do a little more research on this law.
Most people rely on the police because of their expertise in conducting prosecutions, and because of costs.
I feel your frustration having had a similar experience with police refusing to act on a complaint.