Unifor is calling for a workers rally in Windsor to protest during the GM investors event in Detroit on January 11.
When asked if the union would consider litigation against the company like the United Auto Workers in the U.S., Dias said they are considering their legal options.
"Our members were watching the press conference, and when they listened to what we had to say, they didn't go to work", he said.
"Having completed an analysis of Unifor's proposals, GM has determined that it can not pursue them because they would not combat the declining economic and market factors that must be addressed", the company said in a letter from GM Canada president Travis Hester and labour relations vice president Gerald Johnson.
One of Oshawa's most prominent sons is bullish on the small Canadian city's chances of surviving the shutdown of its General Motors Co. plant.
The release of the study comes one day after Dias met with GM officials in Detroit to make his case for extending the life of the Oshawa plant, though he came away from that meeting empty handed and told reporters that the auto manufacturer was guilty of "corporate greed" and was "picking a fight with all of Canada".
Dias had praise for the reaction from President Trump and Ohio's U.S. Senators Sherrod Brown and Rob Portman to news GM planned to end production at four plants, including Lordstown.
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But the company's current stance won't stop Unifor and its leaders from continuing to fight, Dias said. Going into the Tuesday meeting, he has voiced optimism a solution could be found.
With the GM world headquarters towers looming in the Detroit background, a billboard message from Unifor on Wyandotte Street East in Windsor, shown January 8, 2019, has a message about the automaker's Oshawa Assembly Plant.
The company acknowledged the frustration that led to the work stoppages, but urged the union to instead work with the company on timing and transition plans for the approximately 2,600 unionized workers who are losing their jobs. GM said it has identified job opportunities, is willing to pay for retraining, and is open to negotiations on packages for workers on top of what is already included in contracts.
The company responded the suggestions were too expensive and would further deteriorate GM's competitive position.
Photo of the sit-down protest at GM Oshawa courtesy of Unifor. The company employs 8,150 in Canada.
Workers on the evening shift Tuesday night also stopped working, causing the assembly line to stop.