I was wrongfully dismissed? I need lawful advice please...?

I dont know how labor works in Australia but here in the states it would sound like they were trying to keep exempt employees on a continual basis to avoid paying payroll tax and health benefits. I would think about how they would financially gain from this arrangement in your country and bring this to an attorney. You may have a class action lawsuit, which they would more then likely settle depending on the size of the company.