Should any lot or parcel of land be divided after a special assessment thereon has been confirmed and before the collection thereof, the Council may require the Assessor to apportion the uncollected amounts upon the several parts of such lot or parcel of land. The report of such apportionment when confirmed shall be conclusive upon all parties, provided that before such confirmation, notice of hearing shall be given to all the interested parties, either by personal service or by publication as above provided in case of an original assessment roll.