(2) Where, in the case of any registered dealer of an Eligible Unit the cumulative quantum of benefit availed of by him, has exceeded the limit laid down in sub section (I) on the commencement date, or exceeds such limit on any day PG NO 77 after the commencement date, then the Eligibility Certificate shall cease to have any effect in relation to the exemption from payment of tax under this Act or under the , and the Certificate of Entitlement shall stand automatically cancelled on the commencement date or any such day, as the case may be, and such registered 'dealer shall not be entitled to claim any further benefit of exemption from payment of such tax under the Eligibility Certificate of the Certificate of Entitlement on or after the commencement date or any such day, as the case may be, and the dealer shall surrender the Certificate of Entitlement together with all the unused Form BC which have been attested by the Sales Tax authorities to the Commissioner forthwith and in any case within 15 days from the commencement date or any such day.