Jake Finnigan says he and his family have paid an "immense" price for triggering the investigation into the Labor Party's misuse of electorate officers during the 2014 election campaign.

Mr Finnigan said he blew the whistle on the scandal, which cost taxpayers almost $400,000, because his mother taught him "to speak up when something was wrong".

The former Labor staffer said he initially did not want to speak out against the party because he believed it "could do no wrong", but changed his mind when he came across evidence that it "had lied to us".

Jake Finnigan says he and the state have been let down by the Labor Party. Credit:Jason South

Mr Finnigan also claimed a Labor MP leaked his and his family's details to the media, which also prompted him to talk to the Victorian Ombudsman.