Hi, I believe this FAQ addresses your question: https://community.livekit.io/t/frequently-asked-questions-faq/46/18. It sounds like the call is ended, but the dashboard has just not updated.
Unless I have misunderstood the question. To end the call from the agent you can use the EndCallTool, EndCallTool | LiveKit Documentation (recommended), or delete the room, https://docs.livekit.io/intro/basics/rooms-participants-tracks/rooms/#delete-a-room