(2)Where the prescribed income-tax authority considers that the statement furnished under sub-section (1) is defective, he may intimate the defect to the person who has furnished such statement and give him an opportunity of rectifying the defect within thirty days from the date of such intimation or such further period as may be allowed, and if the defect is not rectified within such period, the provisions of this Act shall apply as if such person had furnished inaccurate information in the statement.