Top of the class is Teachers Pensions, run by Capita. It has stopped pension payments to retired teachers who fail to confirm regularly and punctually that they are not dead. It annually asks grieving spouses of deceased teachers whether they have taken a new lover, and its admin backlog is preventing working teachers from getting divorced
https://www.theguardian.com/business/2024/dec/30/and-the-uk-winners-of-the-2024-awards-for-appalling-customer-service-are