Dismissing the appeal the Court held that  ,the assessee had failed to comply with the notices issued under sections 142(1) and 143(2) and had ignored the summons issued under section 131 that followed the notices. In such contingency, the Assessing Officer after taking note of the particulars available on record, the seized documents and the statements recorded during the course of search, completed the assessment. Therefore the best assessment order is valid . The Court also held that the cancellation of exemption u/s 10(23C(vi) was not retrospective . Accordingly the order dated 18-11-2014 withdrawal of the approval granted under S.10 (23C)(vi) had been given effect from the Assessment year 2010-11  and the order cancelling the assessee’s registration u/s 12AA was from the assessment year 2010-11 is held to be valid .       (AY. 2010-11 , 2011-12)