You first steps should be to contact Fair Trading and ASIC. I think it is illegal for a company to trade whilst in liquidation unless any contracts it makes are made by a liquidator. ASIC should be very interested. The more information you can provide ASIC the more likely they are to do something.
Names of the people from the company the strata dealt with while in liquidation would be number one. If these people were also directors of that company they could be in trouble. Even if you didn’t deal directly with them, my view is that the directors are responsible for ensuring this doesn’t happen.