"The Nene case shows how it is hard for Ramaphosa to change the country", Tresca said.
Nene, who was appointed to his post in February after Ramaphosa became president, is under pressure to quit after he revealed last week that he met members of the controversial Gupta family at their home six times.
Ramaphosa, who has pledged to clean up corruption and revive South Africa's struggling economy, has appointed Tito Mboweni, a former head of the South African Reserve Bank, as the new finance minister.
"As former governor of the reserve bank, Mr Mboweni brings to this position vast experience in areas of finance, economic policy as well as in governance", he said.
The three Gupta brothers, who are allies of former President Jacob Zuma, were implicated by the former anti-graft ombudsman in influencing government appointments and the award of state contracts - allegations they and Zuma deny.
Nhlanhla Nene admits he made a mistake " I was wrong for meeting the Guptas at their residence, and not at my office or at least in a public place.
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Both Zuma and the Guptas have denied any wrongdoing.
Mboweni, the nation's fifth finance chief in less than three years, will have to oversee an economy that's fallen into recession and help Ramaphosa rebuild confidence battered by nearly nine years of mismanagement under former President Jacob Zuma. The announcement led to a strengthening of the South African currency, the rand, which had weakened after earlier reports of Mr. Nene's likely resignation.
Apart from serving as Reserve Bank governor, Mboweni also served as labour minister under late president Nelson Mandela.
She said there had been ongoing engagements between the two and that Nene had briefed him on the details around his testimony.
Mboweni clearly loves the social media platform, giving people a glimpse into his life, political thoughts and sense of humour.
"These ministers have demonstrated the same disregard of ethical conduct shown by Nene and, like Nene, they have undermined parliament' s accountability mechanisms", the EFF said in a statement.