(1)Where the Authority finds, on a representation made to it by the Principal Commissioner or Commissioner or otherwise, that an advance ruling pronounced 67[***] under sub-section (6) of section 245R has been obtained by the applicant by fraud or misrepresentation of facts, it may, by order, declare such ruling to be void ab initio and thereupon all the provisions of this Act shall apply (after excluding the period beginning with the date of such advance ruling and ending with the date of order under this sub-section) to the applicant as if such advance ruling had never been made.