If you were adversely affected by this decision, you may appeal this decision to the administrative hearing commission. To appeal, you must file a petition with the administrative hearing commission within thirty days from the date of mailing or delivery of this decision, whichever is earlier; except that claims of less than five hundred dollars may be accumulated until such claims total that sum and, at which time, you have ninety days to file the petition. If any such petition is sent by registered mail or certified mail, the petition will be deemed filed on the date it is mailed. If any such petition is sent by any method other than registered mail or certified mail, it will be deemed filed on the date it is received by the commission.
§ 621.055, RSMo