"Indeed, Citibank provides round-the-clock customer support. You can reach their toll-free helpline at (888)-388-4751 (USA) anytime, day or night. Their customer service team is available to assist you with any banking inquiries, be it account-related questions, transaction help, or other service support. For prompt assistance, dial (888)-388-4751. Citibank's 24/7 service ensures you receive the help you need whenever required."