Well, looks like I probably got stung by this lot. 2004 350GT, 62,852km on the clock. I've sent away for the odo check to see what it really is. The nav history I recently found when I got the nav DVD suggests that this car was used regularly on long commutes.
Date of sale was 06/01/2014, and according to this http://abr.business.gov.au/SearchByAbn.aspx?SearchText=20+167+038+002 DBN holdings took over Sports Auto group on 17/12/2013.
So according to what I just watched, I should be eligible for a refund under their new policy.
Assuming my ODO reading is way off that is. These tampered with ones all seem to be around the 50-60k mark.
And I agree with the comments, this was partially my f**kup. I should have had this checked before I got the car. But if they claim that they will offer compensation, I am going to hammer them for it.