If and when the national program pursuant to the Dairy and Tobacco Adjustment Act of 1983 (Public Law 98-180) establishes a procedure for the return of promotion moneys to the producer, at the producer's request, then and only then shall the Tennessee dairy promotion committee, upon written request of any producer, refund from the funds collected from that producer pursuant to this chapter the same proportion of moneys as the national program. The refund request by affidavit of the individual producers shall provide for the refund of moneys collected from that producer during the immediately preceding three-month period, except producers may request a partial refund. Refund forms shall be provided to producers at the producers' request by the committee, and producers desiring refunds shall file refund forms before the end of the month immediately following the three-month period for which the refund is being requested. Producers shall establish their right to a refund by providing copies of vouchers or sales receipts from processors or buyers showing contributions withheld from the producer pursuant to this chapter.