Those behind the TV show said the ploy "made those behind it filthy rich and left a path of devastation among those who fell victim to it".
Home Funding Corporation changed its name to Vivier Mortgages Ltd and ownership switched to Wewege, the programme said.
Wewege has now taken legal action to clear his name.
The Irish Times reported that High Court documents showed Wewege and Vivier Mortgages Ltd were plaintiffs in a case against broadcaster RTE and journalist Ryan Conor.
The defamation suit was filed on Friday, February 13.
Wewege did not respond to the Herald on Sunday's request for comment.
Wewege, a South African from Amanzimtoti of Italian heritage, left New Zealand shortly after the story of Brown's affair with Chuang broke.
His boss, defeated mayoral contender John Palino, was accused of plotting to pressure Brown into resigning on grounds of ill-health.
Palino and Wewege denied wrongdoing but both went to ground after the publication of texts and Facebook messages suggested they pressured Chuang and schemed to destroy Brown's career.
Wewege, who also spent time around Orlando in Florida, returned to New Zealand last year and reunited with Palino election volunteers.