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But just because there is a complaint does not mean the companies are at fault, says the watchdog.
Travel-related complaints include those about airlines, booking agents, motor vehicle rentals and accommodation.
The Commerce Commission has released guidelines to help traders understand their obligations when making environmental claims.
The agency has fielded more than 100 complaints relating to cancellations and refunds.
The Commerce Commission will no longer seek an interim injunction against Viagogo, after the online event ticket seller made changes to its website.