The amount to be charged for loading, transporting or transmitting and unloading merchandise, household or office furniture, or other bulky articles, by a public mover may be agreed upon in advance. Such contract or agreement shall control and regulate the employment. In every case where such agreement is entered into, the public mover shall furnish the person with whom he or she contracts a written memorandum, to be signed by both parties or their responsible and authorized representatives, setting forth clearly the terms of the contract. This memorandum shall be upon blanks to be approved by the Commissioner of Assessments and Licenses.