Immigration Act 13 of 2002 – foreigner issued with a valid spousal visa subsequently found in possession of a fraudulent visa in breach of s 29(1)(f) of the Act – deemed a prohibited person and not entitled to a port of entry visa or admission into the Republic – high court has no authority to order the Department of Home Affairs to allow him entry into the Republic and to re-issue his spousal visa – such order violates separation of powers – requisites for the grant of an interim interdict against the exercise of statutory powers restated.