The Trade Practices Act 1974 was renamed the Competition and Consumer Act 2010 and has gone through many reviews, but the original principles of promoting efficiency and competition and protecting consumers from unfair practices remain.
The ACCC reviews mergers and acquisitions to determine whether they are likely to substantially lessen competition, with the aim of ensuring that markets work well for consumers.
You have legal rights when dealing with sales agents at your door. If what’s on offer is valued at over $100 (or the value can’t be determined when the offer is made), the agent must follow rules.