(2) Where a tax collection account number has been allotted to a person, such person shall quote such number—

(a) in all challans for the payment of any sum in accordance with the provisions of sub-section (3) of section 206C;

(b) in all certificates furnished under sub-section (5) of section 206C;

(c) in all the returns delivered in accordance with the provisions of sub-section (5A) or sub-section (5B) of section 206C to any income-tax authority; and

(d) in all other documents pertaining to such transactions as may be prescribed in the interest of revenue:

Provided that the provisions of this section shall not apply on or after the 1st day of October, 2004.