Ind. Code § 7.1-2-7-5

Sec. 5. Hearing of Aggrieved Party. A resident of this state who is aggrieved by an order of the commission entered under this chapter, may file, within thirty (30) days after the entrance of the order, his written complaint with the commission asking that the order be vacated or modified on the ground that it is unreasonable, insufficient, or unlawful. The petitioner shall set out in his complaint the facts and reasons on which his claim is based. The complaint shall be set for hearing before the commission not less than thirty (30), nor more than sixty (60), days after it is filed.