Durban — Long serving ANC alliance partner the Congress of South African Trade Unions (Cosatu) in KwaZulu-Natal has broken ranks, saying the once-ruling party was teetering on the brink of total collapse due to the unemployment rate.On the back of this, Cosatu has planned a national march on October 7 to counter the increasing unemployment rate which is at 33%.In an interview with the Daily News, Cosatu’s provincial secretary in KZN, Edwin Mkhize, said their hands were “tied” as a federation and they were tired of being exploited as workers.“The ANC will not serve the previously…