In the UK there is a reasonably simple legal process - the Small Claims Division of the County Court (to give it its full title), more commonly known as the Small Claims Court.
It is specifically for "the little man" to pursue claims not exceeding a certain value against companies or individuals. Costs £30 to file a case (you get that back if you win).
I have used it successfully in the past to get a monitor replaced when it stopped working - and after many phone calls and letters (ignored).
It's amazing how quickly problems get resolved when the company involved gets a summons in the post!
Is there a similar process in Aus?
SD