364.08  Unlawful to charge other than schedule rates or charges; free service and reduced rates prohibited.--

(1)  A telecommunications company may not charge, demand, collect, or receive for any service rendered or to be rendered any compensation other than the charge applicable to such service as specified in its schedule on file and in effect at that time. A telecommunications company may not refund or remit, directly or indirectly, any portion of the rate or charge so specified or extend to any person any advantage of contract or agreement or the benefit of any rule or regulation or any privilege or facility not regularly and uniformly extended to all persons under like circumstances for like or substantially similar service.

(2)  A telecommunications company subject to this chapter may not, directly or indirectly, give any free or reduced service between points within this state. However, it shall be lawful for the commission to authorize employee concessions if in the public interest.