International education institutes with links to visa fraud should be named and shamed, the Labour Party said after new data showed "endemic'' levels of fraudulent activity.
Documents released to Labour under the Official Information Act reveal the huge increase in fraudulent applications by immigration agents representing Indian students wanting to study in New Zealand.
It comes as Prime Minister John Key heads to India, which is a major source of students for New Zealand's $1 billion international education sector.
Immigration New Zealand began taking a tougher line on student visa applications in May out of concern about fraudulent activity.
International students have to prove they can financially support themselves in New Zealand, and some Indian-based agents had been using fraudulent bank statements in visa applications, assisted by corrupt bank managers.
Immigration New Zealand (INZ) documents released to Labour showed the number of fraud cases had risen from 75 in April to 640 cases in August.
The number of agents involved in fraudulent activity rose from 60 to 300 over the same period.
Some of the applications have been found to be false months after students arrived in the country, and now face deportation. Students are appealing to the Government for the deportation orders to be cancelled, saying they were misled by agents.
Labour Party immigration spokesman Iain Lees-Galloway said the education providers, which enlisted the agents, needed to show more accountability.
In one case, an unnamed institute was linked to 47 cases of fraud alone. Others were linked to more than 30 cases.
Their details were redacted in the INZ documents, and Mr Lees-Galloway said they should now be named to encourage accountability.
The documents also showed the cat-and-mouse game being played between INZ officials and immigration agents.
Agents who were found to have submitted fraudulent applications often re-emerged under a new name, which INZ called "phoenixing''. INZ said their numerous identities were difficult to track.
About a quarter of new agents were believed to be old agents "rebranding themselves''.
However, the number of applications from India has now slowed, and INZ said this showed its crackdown was having a positive impact.
The Government has set a goal of growing the international education sector to $5 billion by 2025.
Mr Lees-Galloway said the fraud problems encountered by INZ were a warning sign, and the department would need more funding to cope with further growth in the sector.