There is actually a person in charge. It is the director general of the Office of Consumer Affairs. He has been in that position for at least five and a half years. I have been a deputy minister for five years and a half and he has since been in the same position.
In the 60s and the 70s, there was a Department of Consumer and Corporate Affairs. The department was reworked in 1993 during the government reorganization, I believe. It was merged with three or four departments to create the Department of Industry as we know it today.