if the unconditional withdrawal of the amount deposited as provisional value precludes the defendants-appellants from questioning the right of the plaintiff to expropriate , it must necessarily follow that said withdrawal also estops defendants-appellants from raising any objection to the manner and propriety of the exercise by the plaintiff of the right of expropriation ( 18 american jurisprudence 634-635 , francisco 's the revised rules of court in the philippines , vol .