The statements made by both sides in the dispute have not yet been tested in a court of law.
While Bernier went on to lose his seat in the Quebec riding of Beauce in the 2019 election, Singh won the British Columbia riding of Burnaby South.
Bernier s lawyer Andre Marin declined to comment when reached by CBC News.
The documents filed recently in court are the latest twist in a tale that began in October 2019 when a source told media outlets about Project Cactus.
At the time, a source told CBC News that the campaign was funded by the Conservative Party of Canada (CPC) something that then-Conservative leader Andrew Scheer refused to confirm or deny.