TORONTO (AP) — The Canadian Competition Bureau said Friday it is suing the country’s three biggest wireless carriers and an industry association for US$31.79 million (CA$31 million) in customer refunds over what it called “misleading” advertising of texting services.

“Our investigation revealed that consumers were under the false impression that certain texts and apps were free,” said bureau commissioner Melanie Aitken. She said many only discovered the fees when they got their phone bills.