Thousands of workers at the South African Post Office (SAPO) and Telkom downed tools on July 6 to demand higher wages.
They are affiliated to three unions - the Communication Workers', Customs and Democratic Postal and Communications unions, GroundUp reported.
The workers are demanding a 12% increase but SAPO insists it can only afford an across-the-board salary increase of 6% for all employees from August 1.
The strike has left hundreds of social grant beneficiaries stranded.
In Pietermaritzburg, beneficiaries were seen standing in snaking lines outside the post office in Langalibalele Street.
Pay increase