With reference to the more than 20 000 fraud cases reported by the SA Social Security Agency in 2019, what (a) total number of the specified cases have been resolved, (b) total amount has been recovered, (c) total number of implicated persons have been (i) fired, (ii) suspended, (iii) imprisoned and (iv) found not guilty and (d) total amount has been (i) lost through fraud and (ii) spent on investigations?