The Inland Revenue Department says the latest telephone phishing scam is unusual because it's still generating about 200 complaints a day despite media publicity that typically causes these types of scams to disappear.
Over the past two weeks, the IRD has received complaints from some 3,000 customers and has confirmed reports of at least two people following the scammers' instructions.
IRD general manager of customer services Eleanor Young said it's impossible to know how many other people have been contacted by the scammers that haven't laid complaints. Even IRD's own staff have been targeted.
The scam calls are being made to landlines and mobile phones with messages left on voicemail if the calls remain unanswered.
People are told in a threatening and intimidating way by both male and female callers that they are from the IRD and that the customer is either wanted for historic tax evasion or fraud, there is a red flag on their file, or they are in debt, and that they or their lawyer must return the call as soon as possible.