EDF has been named the worst energy supplier in the UK for customer service, with its call waiting times increasing from under a minute to over five minutes within a year, leading to numerous complaints and billing errors. Citizens Advice reported that overall customer service in the energy sector has reached an all-time low, with a 10.5% decline in ratings since 2021. Utilita and British Gas were also among the lowest-rated suppliers, while smaller firms like Ecotricity and Outfox the Market scored highest. The energy crisis, which escalated wholesale gas prices and household bills, has exacerbated the situation, pushing millions into debt and increasing the need for support. Citizens Advice is advocating for a 'Consumer Duty' to give Ofgem stronger powers to enforce better customer service standards.