Which organization collects consumer complates stops unfair practices and sues companies

The correct answer would be Consumers Affairs Authority.

Explanation:

Consumer Affairs Authority is the organization or department which was established to take the customers complaints against different problems which they may face regarding the unfair practices by the companies. This department was established to protect customers rights. This department see if the prices set by the companies are justified or not. They regulate the trade and the price structure of the goods and services to protect the consumers against the unfair practices by different companies, manufacturers or suppliers.

Consumer Affairs Authority is the organization which takes up consumer complaints