We are exactly the same. Marketing specialist DE 2 people applied in July 2016. I have called but they said my file is still in queue no CO allocated yet.
You better ask you MA, as I know, you can withdraw but you will immediately lose your bridging, so you will need to apply student visa first and then asvise DIBP to withdraw current one.
Does anyone here also submitted for the occupation-marketing specialist WA ? I have submitted visa 7/2016 but didn't get any update yet:( So frustrated.