35 Miss. Code R. § 10-09-505
When the rebate request is received the MDOR will determine if the submission is in the proper format to perform the review. If the request is not in the proper format, it will be sent back with an explanation containing the formatting requirements that were not met. The rebate request will be denied if a suitable submission is not received within six (6) months. A rebate request that is submitted in the proper format will be reviewed and the review will be sent to the MPPC. The MPPC must respond to the MDOR review or any subsequent reviews within six (6) months. If there is no response in the form of additional documentation or agreement to the rebate amount, then the qualifying rebate amount will be paid out and the remaining request will be denied. When a rebate request is denied the MPPC should review their appeal rights located at www.dor.ms.gov. The MDOR will review any additional information provided by the MPPC for a period of one year from the denial date.
35 Miss. Code. R. § 10-09-505