Unless a run-off election is to be held or an investigation is to be made under § 4-212 or § 4-213 of this subtitle, immediately after the period for filing an objection has passed, the Mediation Service shall certify to each party to a consent election the result of the consent election. If a labor organization wins a consent election, the certification of the result of the consent election shall include a certification of the organization as bargaining representative. The rulings and determinations of the Mediation Service under this subsection are final. Unless the Mediation Service certifies the result in accordance with subsection (a) of this section or receives a timely exception under § 4-215 of this subtitle that, the Mediation Service determines, raises a substantial and material issue with respect to the conduct or result of a consent election, the Mediation Service immediately shall: decide the matter on the record; or dispose otherwise of the case.