GMB Scotland said members in Glasgow city council's cleansing department would strike for a week from 00:01 on Monday.
The union accused the council of failing to give members "proper time and space" to consider an offer from local authority body Cosla.
GMB Scotland secretary Louise Gilmour confirmed the strike was back on.
She said: "The council has failed to give our members the proper time and space to consider the 11th hour offer from Cosla, and the fact the council moved to block strike action in the Court of Session using anti-trade union legislation, means there is too much bad faith among members towards the employer.
The GMB denied workers were using the global climate conference as a bargaining chip but said staff had been "put in a corner" by Cosla despite their efforts during the pandemic and were "fed up of being disrespected and undervalued by the government".