No motor carrier of household goods or passengers shall charge, demand, collect, or receive a greater or lesser or different compensation for the transportation of household goods or passengers or for any service rendered in connection therewith than the rates, fares, and charges prescribed or approved by order of the department; nor shall any such motor carrier unjustly discriminate against any person in its rates, fares, or charges for service. The commissioner may prescribe, by general order, to what persons motor carriers of passengers may issue passes or free transportation; may prescribe reduced rates for special occasions; and may fix and prescribe rates and schedules.
OCGA § 40-1-119