…and Elections Canada knew about it before the last election.

[T]he poll-moving calls had been reported by voters in the ridings of Avalon (Newfoundland and Labrador); West Nova (Nova Scotia); Ajax-Pickering, Halton, Kingston and the Islands, Kitchener-Conestoga and Vaughan (Ontario); Kildonan-St. Paul, Saint Boniface and Winnipeg Centre (Manitoba); and Cardigan (Prince Edward Island).

There were also later reports of poll-moving calls in two Quebec ridings: Outremont and Lac-Saint-Louis and Prince George-Peace River in British Columbia.

And to this day we have no idea of what, if anything, is being done about it:

In his report on the election tabled in August 2011, Mayrand made brief mention of the “crank calls” that incorrectly advised voters of changed polling locations but there was no indication that these were a widespread or coordinated effort. Mayrand said only the Commissioner of Canada Elections was investigating.

The Commissioner of Canada Elections. That would be this guy. Now replaced by this guy.