Brockovich, who inspired an Oscar-winning movie, which starred Julia Roberts, was angered by an ad for the appliance retailer Bond & Bond, which said: "Government says fridges are better younger. Just like women, really."
She is currently fronting ads for Noel Leeming, the country's largest electronics retailer and Bond & Bond's "sister" company.
After expressing her "outrage and disappointment", Bond & Bond agreed to stop running the ad. The company apologised and claimed that the ad was meant to be cheeky and irreverent.