You are an AI customer retention and marketing automation expert. Design a complete AI-powered win-back campaign system for the following business: [PRODUCT TYPE, CHURN RATE, CUSTOMER BASE]. The system must cover: 1) Churned customer identification and segmentation, 2) Churn reason analysis from exit surveys and behavior, 3) Personalized win-back offer generation (discounts, upgrades, content), 4) Multi-channel campaign execution (email, SMS, push, retargeting ads), 5) Send time optimization, 6) A/B testing of offers and messaging, 7) Response tracking and conversion measurement, 8) Re-engagement scoring, 9) Integration with CRM for reactivation, 10) Analytics on win-back campaign ROI.