MONTREAL - A local Liberal MP wants to get to the bottom of phone calls he says some of the voters in his riding received.

Irwin Cotler alleges misleading robocalls were made about where people in the west-end Mount Royal riding could vote.

"It just puts a cloud over the whole process," said Cotler. "Constituents in my riding received misleading robocalls as to where they would be voting and given misleading information as to the place at which they were to be voting."

Cotler is not alone in making the claims. In the West Island Lac-Saint-Louis riding, where the Conservatives had high hopes for star candidate Larry Smith, Liberal MP Francis Scarpaleggia claims his constituents also received calls in the lead-up to the federal election in May 2011.

"The office had received some calls from confused voters who had received a call telling them that their voting station had changed," he said.

The perpetrator of the alleged calls went to great lengths to cover their tracks.

Court documents show a cellphone in the robocalls affair was registered to a "Pierre Poutine" of "Separatist St." in Joliette.

Elections Canada's chief investigator says the clearly fake name was likely used to cover the tracks of whoever was behind misleading and harassing calls to voters in the last federal election.

The phone was activated two days before the election.

The opposition points the finger at the Conservatives, and alleges fraudulent robocalls were made in some 30 ridings across Canada. The perpetrator of the calls could face charges resulting in anything from a $5,000 fine to a five-year jail term, according to Canada's former chief electoral officer.

Harper and fellow Conservatives say there is no proof to back up the allegations of a widespread, dirty-tricks campaign in the last election.

The NDP scoffed at that.

"Who the hell uses a burner cell phone and is not trying to hide something?" NDP MP Pat Martin said.

"If you're trying to tape a recording through an Edmonton company to play in Guelph, Ontario, why the hell do you use a burner cell phone in Montreal? Only dope dealers and Hells Angels and Tony Soprano use burner cell phones."

With a report from The Canadian Press