Johannesburg - The Congress of SA Trade Unions said on Monday it was "extremely concerned" about the sacking of Estate Agency Affairs Board CEO Nomonde Mapetla."Cosatu is extremely concerned at the illegal and unprocedural dismissal of Nomonde Mapetla, as chief executive of the EAAB," spokesperson Patrick Craven said in a statement.Mapetla was "placed on special leave" on February 17, allegedly "to afford the board the opportunity to undertake an investigation into possible operational and governance irregularities that might have occurred at EAAB", Craven said."Then on 28 February the board served her with a dismissal letter, terminating her employment contract... She was not given a hearing or even a charge sheet."The EAAB announced on Tuesday that "the employment contract between itself and Mrs Nomonde Mapetla, the erstwhile chief executive officer, has been terminated with immediate effect due to an irreconcilable breakdown in the working relationship between the parties".Mapetla's contract was due to expire on July 15."The board is steadfastly confident that, in the interim, the EAAB will continue to fulfil its statutory regulatory functions and duties in an effective and efficient manner," the board said in a statement.The EAAB is the regulator of the country's 27 000 estate agents.Mapetla is challenging her dismissal. The matter will be heard by the High Court in Johannesburg on Tuesday.