At least five entities linked to the popular frozen yoghurt chain have gone into receivership or liquidation.
Significant criminal activity alleged.
PwC has written to more than 30 investors it believes it may have claims against.
B'On Financial Services was described as a ponzi scheme, fleecing clients of about $14.4 million.
More than 900 people are owed about $7 million.
Business practices of property developer Tony Gapes criticised in High Court judgment on challenge to liquidator.
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