Never hurts to call. I upgraded my licence at the end of November, assuming this would be plenty of time for it to be processed before the Victorian expo on the 18th of Feb. 3 weeks before expo I called them to find out where it was and they said they had not received any money from me, even though the money was taken out of my account 2 days after I sent my forms in!
Once I gave them dates and the cheque number they were pretty quick to sort it out, my licence arrived within days.
So glad I didn't just keep on waiting for it to arrive on its own!