In majority cases, you may be eligible to approach AAT for review of your application.
From 1st of July 2015, the working of Migration Review Tribunal (MRT) and Refugee Review Tribunal (RRT) were incorporated into Migration Division of AAT that reviews the decisions made by the Federal Government.
Administrative Appeal Tribunal is the only body that has authority to review the merits of a visa application.
The AAT reconsiders your case file entirely reviewing the facts provided, laws relating to the decision and arrive at a new decision. AAT examines your application afresh reviewing the documents, evidences, forms and all the information you have provided to the department.
There is a TIME LIMIT!
When you are applying for an appeal, you must lodge the application for review within the timeframe specified in the notification letter of decision. There may also be an additional application fees for the appeal application.
The processing time may again vary depending upon the case category. However, generally the durations are long ranging anywhere around 12 to 18 months.
It is only in special cases where you may request for an assessment on priority basis.