The corporation commission is hereby authorized and empowered to require and compel the furnishing of such service. Upon complaint to the corporation commission that any telephonic service with any railroad, telegraph or express company’s buildings, offices or grounds is inadequate or in any respect unreasonably or unjustly discriminatory or that such service cannot be had, it shall be the duty of said commission to investigate the same, and if upon investigation the commission shall find that any telephonic service is inadequate or unreasonably or unjustly discriminatory or that such service cannot be had, it shall determine and by order fix a reasonable regulation, practice or service to be installed, imposed, observed and operated in the future.