The Treasurer, Constable, and collectors shall severally give good and sufficient bonds to the City to be approved by the City Council, in such sums as may be fixed by said Council, and in case of their failure to give bonds as aforesaid within 10 days after their election to said office, the office shall be vacant and it shall be the duty of the City Council to fill all such vacancies and all those caused by death, resignation, or otherwise.