(5)The applicant shall remove the defect within a period of fifteen days from the date of such intimation or within such further period as may be extended by the Central Board of Direct Taxes, on an application made in this behalf by the applicant, so however, that the total period for removal of defect does not exceed thirty days, and if the applicant fails to remove the defect within such period as allowed, the Central Board of Direct Taxes shall pass an order treating the application as invalid.