Twenty-eight female guards were unfairly dismissed by a security company because the client‚ Metrora.
The sexual harassment case against Mogale City human resources manager Humphrey Mmemezi will be heard in the South African local government bargaining council next month.
This comes after the municipality was accused by the union and the four women who laid complaints against him of "stalling the case".
Women rights groups also said the municipality was using a technicality to stall the case.
The four women laid sexual harassment charges against Mmemezi with the Independent Municipal and Trade Union (Imatu) and police three months ago.
Imatu Krugersdorp chairman Mike Miller said: "We have been waiting for the municipality to come back to us after we disagreed about the women laying individual complaints."
The case will be heard by the bargaining council after a letter sent to the municipal manager Dan Matshitiso on October 9.
The union demanded immediate intervention by the municipality to resolve the case.
Miller said the municipality had not responded so the case would go to the bargaining council in Benoni.
Last week hundreds of Mogale City residents protested outside the council offices and demanded Mmemezi's immediate suspension.
"We demand that action be taken against Mmemezi in order to stop allegations that he is being favoured because he is a member of the ANC," the angry protesters said.