The Competition Bureau is suing Canada's three biggest wireless carriers and an industry association.

It's seeking a total of $31 million in customer refunds and administrative penalties for allegedly misleading advertising.

The bureau says it's taking legal action after a five-month investigation into the companies' advertising of premium texting
services.

Its allegations have yet to be tested by a court or tribunal. 

The federal agency is seeking $10 million each from Bell, Telus and Rogers, the country's three-largest wireless carriers.

It's also seeking $1 million from the Canadian Wireless Telecommunications Association, the industry's main lobby group.