A NZ citizen of Middle Eastern origin says he is discriminated against by Customs officials who interrogate every time he returns home.

Police know of at least 30 people have handed over millions of dollars to an alleged fraudster over the last 20 years.

Police are seeking victims of James Lindon Graham who is accused of deceiving "many" in a multi-million dollar fraud lasting over 20 years.

Changes could be in place by Christmas.