If a truly necessary party is still not joined even after a clear objection, the court may treat the suit as improperly framed and either dismiss it for non-joinder or pass a decree that later gets attacked as incomplete or not binding on the missing person, causing appeals or remand. To deal with this, good lawyers make sure the objection is on record at the earliest (in the written statement or an application), ask the court to first decide whether that person is a necessary party, and then press for an order directing the plaintiff to implead them within a fixed time, often with costs. If you’re for the plaintiff, the safest way to prevent dismissal is to comply quickly: move an impleadment application, amend the memo of parties and prayer, and get the new party served so the court sees you’re curing a procedural defect, not abusing process. If you’re for the defendant and the plaintiff still refuses, you push for an issue on non-joinder and argue that no effective decree can be passed, inviting the court to dismiss the suit or at least record a finding that protects you and sets up strong grounds for appeal.