If any express company, through any agent or employee, shall demand and receive of a consignee any charge or part of a charge which had been prepaid, or a greater sum than the company had agreed to perform the services for, or more than reasonable compensation for any service rendered, the consignee or person paying the overcharge shall be entitled to recover of the company twenty-five dollars, in addition to damages for any injury.
Any package, which the company shall receive and transport marked “paid” or “pd.,” or otherwise so marked as to indicate prepayment, shall not be charged for at the point of delivery, under the same penalty.