Register a .com (not .com.au) website and pay extra for it to be anonymous.
Get the cheapest hosting you can find.
Create a website with WordPress.
Protect its content with a password
Load it up with lot of material detailing your gripes (try not to make it personal, defamatory, abusive or generally nasty)
Send a note saying “do you want to know how your EC is costing you thousands of dollars a year?” to all owners.
Include the website address and the password
Communicate only using the website’s email facility.
This will cost less than $80 – roughly the same as a complaint to Fair Trading.
Be prepared for dog’s abuse when they find out it’s you – and they will because you won’t be able resist telling someone that you are SecretStrata.