(a) Whenever verification by the commissioner of reports or payments of any marketer discloses errors made in payments to or from the equalization fund, the commissioner shall promptly bill such marketer for any unpaid amount, and such marketer shall, within five days, make payment to the fiscal agent of the amount so billed. Whenever verification discloses that payment is due from the equalization fund to any marketer, the commissioner or a person duly designated by him, shall as promptly as possible direct the fiscal agent to make such payment to such marketer.

(b) Whenever the commissioner shall be required pursuant to sections 21.60-21.68 of this Part to make payment to a marketer from whom any amount is due to the equalization fund, he may instead issue credit therefor to the extent of such amount due.

(c) Whenever verification by the commissioner of the payments to any producer or cooperative association, for milk delivered to any marketer, discloses payments to such producer or cooperative association of less than is required pursuant to section 21.60 of this Part the marketer shall make up such payment to the producer or cooperative association not later than the time of making payment next following disclosure.