its most likely u will have to contact the State Debt Recovery Office now. Usually they send out 2 reminders, then refer it onto the SDRO and they send an enforcement order, if u dont pay that they send u a Licence Suspension notice and if u dont pay that they suspend your licence, and cancel the rego of any cars under your name. you cannot lift the restirctions until u have paid all the fines.
best bet ring the SDRO with ur name and old address detiasl and find out what they have on file for you.