There are calls for a cluster of international investment scams to come under scrutiny.  

Financial expert Janine Starks wants a banking ombudsman to launch an investigation after accusing banks of corporate failure. 

She says there's systemic failures with foreign scams estimated to be stealing up to $200 million a year from New Zealanders. 

Massey University banking expert Claire Matthews told Kate Hawkesby that it's difficult to know what an investigation might show.  

She says it may reveal banks are doing everything they can, or it may show there are things they could be doing better. 

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