What (a) number of investigations were conducted at the Komani Psychiatric Hospital in Queenstown in the Eastern Cape relating to instances of (i) overbilling and (ii) overcharging for goods and services rendered by service providers (aa) in each of the past three financial years and (bb) since 1 April 2018, (b) number of the specified investigations were conducted by the Office of the Public Protector, SA Police Service, Special Investigating Unit and/or external private sector entities, (c) amount in income did his department lose as a result of overbilling and overcharging by service providers, (d) was the outcome of each investigation and (e) amount in income was recovered as a result of the investigations in each case?