06/01/2014 01:30 EDT | Updated 08/01/2014 05:59 EDT

Some of the key facts behind Canada's ongoing robocalls controversy

OTTAWA - Some facts about the robocalls controversy:

— The Commissioner of Canada Elections received over 40,000 general communications and complaints about robocalls after the 2011 federal election. Most were from people who said they had not actually received an inappropriate call, but wished to express concern that these kinds of calls had taken place.

— On polling day, May 2, hundreds of calls purporting to be from Elections Canada and giving erroneous poll information were made in the riding of Guelph. Investigators linked the calls to pay-as-you-go cell phone belonging to a non-existent subscriber, identified only as "Pierre Poutine."

— Most of the complaints to the commissioner came after news stories were published about the robocall investigation.

— People from seven ridings went to Federal Court asking that the election results in those constituencies be overturned because of robocalls. One case was dropped, six proceeded.

— A Federal Court judge eventually concluded that fraud was a factor in the robocalls, and that the Conservative party database known as the Constituency Information Management System, or CIMS, was likely the source of the contact information used, but said that was not enough to overturn the election results.

— One person, former Conservative staffer Michael Sona, was charged with having wilfully prevented or endeavoured to prevent an elector from voting in connection with the Guelph robocalls.

Quote: "The scale of the fraud has to be kept in perspective." — Federal Court Judge Richard Mosley in a May 2013 decision.