Any sheep or goat producer against whom any assessment is made and collected under authority of this article, if dissatisfied with the assessment, may demand and receive from the treasurer of the certified association a refund of the amount of the assessment collected from the sheep or goat producer. A demand for refund must be made in writing within 30 days from the date on which the assessment is collected by the commissioner. The application for refunds of amounts collected shall give the name and address of the producer. Within 30 days after the first quarterly receipt of funds from the commissioner, and thereafter within 30 days after receipt of an application for a refund, the certified association shall, after the association determines that the assessment was paid as claimed in the application, refund the amount so paid as an assessment. The mailing by the association of a valid check in the amount of the assessment, payable to the sheep or goat producer, within 30 days after receipt of the application for refund, shall constitute a compliance with this section.