Consumer NZ is joining overseas consumer groups to help investigate complaints about ticket reselling sites.
It will join forces with groups from Australia and the UK looking at complaints about sites such as Viagogo and Ticketmaster Resale.
"We've heard reports of tickets being sold on resale sites in New Zealand for up to twenty times their face value," Consumer NZ chief executive Sue Chetwin says.
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"Customers also routinely report being stung by steep fees on these sites."