(a) What number of cases with regard to corruption in his department involving officials marrying South African citizens to foreign nationals with the aim of securing citizenship and/or permanent residency (i) have been reported, (ii) are currently being investigated internally by his department and (iii) have been resolved, (b) what number of officials of his department have been charged criminally for the specified crimes against the State and (c) what plans will he put in place to combat this issue status?