The question still remains as to what CASA have actually done to make Dick's aircraft safer or is this just a compliance issue. If it is just compliance filling in a form and sending it off with FAA approved documentation should have been enough. Sure you might have had to pay $200 for the form to be processed but 4k is ridiculous!
If it was me I would be asking for a complete breakdown of the hours spent by CASA and would like to know how they have justified it. If they cannot give you this they are ripping you off and a call to the.....oh wait. Where do we go to complain about CASA again?!?!
Agree with a previous comment also that nothing will change unless we get a new minister of aviation or transport that actually knows what they are doing.