JOHANNESBURG - The South African Transport and Allied Workers Union (Satawu) has rejected Transnet's 6% wage offer.
Satawu and the United National Transport Union (Untu) have been holding out for a 13% wage increase.
The unions have also received support from labour federations the Congress of South African Trade Unions (Cosatu) and the South African Communist Party (Sacp).
Meanwhile, three government ministers stepped in to try and end the strike at Transnet.
Public Enterprises Minister Pravin Gordhan, Labour Minister Thulas Nxesi and Agriculture Minister Thoko Didiza engaged with unions and the Transnet board.
Satawu says the ministers joined the meetings to encourage the parties to try and find each other.
Watch the video above for more details.