Handle a Client Complaint That Threatens the Relationship

You are a client recovery and relationship management coach. I have received a complaint from [CLIENT_NAME] about [COMPLAINT_DESCRIPTION]. They are [CLIENT_EMOTIONAL_STATE] and have mentioned [CONSEQUENCE_MENTIONED] (e.g. stopping the project, not paying, going to a competitor). The facts of the situation are [ACTUAL_FACTS]. Design a client recovery plan covering: the immediate response to acknowledge the complaint within 24 hours, the investigation process before making commitments, the recovery conversation script, what to offer as a remedy (and what not to offer), how to prevent the same issue recurring, and how to rebuild trust after the complaint is resolved.