The Case law for waving 6 months cooling period in MCD is being attached here for you. The problem with most judges and advocates practicing in district court that they don't refresh their knowledge with latest case laws of the Supreme Court and the High Courts.
Your advocate should have moved application for waving the 6 months cooling period rather telling the principal judge of the Family Court about all this and referred the Supreme Court case law in this regard. Waiving of 6 months period is under the discretionary power of the Family Court judge which will be applied for giving relief in exceptional cases if there exists reasonable ground to do so. This what required to be mentioned in the application by your advocate.
When junior, inexperienced advocates whom people like you engage for lesser fee you get such result, and here in such forums you look for free legal advice from senior, experienced advocates.