With reference to the contingent liabilities of his department that were R2,189 billion as at 31 March 2020 and the 13 extra lawyers who were employed later in 2020 to deal with the specified cases, what (a) were the total contingent liabilities at (i) 31 March 2021, (ii) 31 March 2022 and (iii) 31 March 2023 and (b) was the total cost of the lawyers hired to deal with contingent liabilities in the period 1 April 2020 to 31 March 2023?