Before a license to conduct a grain warehouse is granted under Section 75-44-23, the grain warehouseman shall file with the commissioner a copy of his schedule of charges for storage and other services. If the grain warehouseman desires to make any change in the schedule of charges during the license period, he shall file with the commissioner a statement in writing showing the change at least thirty (30) days prior to its effective date. Each grain warehouseman shall keep conspicuously posted the schedule of charges for storage and other services as so filed, and shall strictly adhere to these charges.