Before any rate shall be affixed, established or changed by the Public Service Commission, the railroad company to be affected thereby shall have at least twenty (20) days' notice of the time and place when and where the matter of fixing or changing such rate will be considered by the Commission in session; and said railroad company shall be entitled to be heard at such time and place, to the end that justice may be done.
S.C. Code Regs. § 103-30