To contact Citi Bank customer support, you can find their official customer service number on their website or on your banking statements. Typically, you can call their general customer service line, which is available 24/7 for assistance with account inquiries, card issues, password resets, and more. Be prepared to verify your identity for security purposes when speaking with a representative. Additionally, Citi Bank often provides online chat support and has a secure messaging feature through their website or mobile app for non-urgent queries. Always ensure you’re using official contact information to avoid scams or fraudulent activity.