More than 4000 extra people have signed up overnight to join a legal bid to sue the banks over penalty fees after ANZ was named yesterday as the first target.
Ben Hardwick from Australian law firm Slater & Gordon - one of the legal parties behind Fair Play on Fees - said the number of new sign-ups was not surprising.
"I think there is a lot interest. A lot of people have been sitting back and waiting to see if we would proceed. Now that we have I expect them to continue to jump online and sign-up."
The increase brings the total number of bank customers to over 28,000 Kiwis - of which at least 11,000 are ANZ customers.
Auckland lawyer Andrew Hooker, who is leading the Fair Play on Fees campaign, said about two thirds of those who had signed up in the past 24 hours were ANZ customers.