The purpose of the Bureau of Consumer Protection can be seen in the name of that agency. It was created in order to prevent consumers from being defrauded by companies using fraudulent practices of various sorts.
The idea behind this bureau is that it is easy for companies to mislead consumers. Consumers often do not have the knowledge they need to determine whether a given company and its claims are legitimate. Therefore, the Bureau of Consumer Protection was established to prevent companies from exploiting this weakness on the part of consumers.
As the Bureau's website says, it was created in order
to protect consumers against unfair, deceptive, or fraudulent practices in the marketplace.