A person who alleges an error in calculation of assessments may call the alleged error to the attention of the finance officer, who shall determine whether there has been an error in fact. If the finance officer finds that there has been an error in fact, he or she shall recommend to the council an amendment to the assessment ordinance to correct such error – and upon enactment of the amendment, the finance officer shall make the necessary correction in the docket of city liens and send the correct notice of assessment to the property owner by certified mail.