(4) If the person from whom such tax is recoverable does not pay the sum due, together with the costs and charges, within the said 30 days, the goods and chattels distrained upon shall be sold by public auction by the authorised person or any person deputed by him or her for payment of the sum due and all costs and charges. The costs and charges of taking, keeping and selling the distress shall be retained by the authorised person or any person deputed by him or her, and any surplus arising from the distress, after the deduction of the costs and charges and of the sum due, shall be restored to the owner of the goods and chattels distrained.