A journalist named Thibaut Martinez-Delcayrou has uncovered a growing scam in France involving fake bankers who exploit personal and banking data to impersonate trusted individuals over the phone. These fraudsters, often using sophisticated methods, convince victims to transfer money under false pretenses. According to the journalist, these scams affect nearly a million people each year in France and have resulted in more than one billion euros being stolen from individuals. The issue has become a significant concern for both victims and institutions trying to combat it. Martinez-Delcayrou begins his investigation in 2020, when a group of eight individuals gained access to thousands of banking data records. This breach served as a starting point for understanding how fraudsters operate. He traces the mechanics of the fraud, including how stolen data is used to create convincing impersonations and how these scams are relayed through various channels. His work also examines the responses from financial institutions, law enforcement, and the legal system, highlighting the challenges faced in addressing such crimes. Between December 2023 and March 2025, Martinez-Delcayrou claims to have worked with 2,500 documents and 150 testimonies collected from a wide range of sources. These include police, judges, lawyers, victims, fraudsters, political figures, banks, and telecommunications operators. His thorough investigation aims to reveal the scale of the problem and the complex web of actors involved, from those who steal the data to those who facilitate the fraud. Thibaut Martinez-Delcayrou is a journalist with France Télévisions, working for the Franceinfo TV investigative cell. He previously collaborated with Le Figaro and France Télévisions. He is also the author of Faute ! Dans les coulisses des plus grandes polémiques arbitrales, published by Hugo Sport in 2022. His work on this scam continues his reputation for uncovering high-profile issues and providing in-depth analysis on complex societal challenges.