He is pretending to be the fraud service of La Banque Postale
A person calls you and says they are from the Metropole fraud service. They give you your name, first name, postal address, email, and ask you to confirm a transaction in order to cancel other fraudulent transactions... They then ask you to confirm a transaction appearing on your phone using your Certicode, and that's when I realized I shouldn't do it... and then the person hung up... damn son of a b**** 馃が