In an attempt to turn up the heat on Canada Post and help end a lengthy contract dispute , postal workers say they’ll stop delivering flyers starting Monday.

The announcement Friday from the Canadian Union of Postal Workers came just over three weeks after the union presented a counter-offer to the Crown corporation’s “final” contract offer .

“Instead of responding, they issued an ultimatum: change our offers or they would walk away, with no commitment to return,” CUPW national president Jan Simpson said in a written statement. “We’ve been left with no choice but to change our strike activity with the hope that Canada Post finally takes us seriously and returns to the bargaining table.

Jan Simpson, the president of the Canadian Union of Postal Workers, says a ban on overtime work at

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