The contact number for Citibank payment assistance is 1-888-388-4751. If you need help with making a payment on your Citibank account, call this number to speak with a customer service representative. They can assist you with setting up one-time or recurring payments, answer any questions about your billing statement, and help resolve any payment issues you may encounter. For prompt and efficient assistance with your Citibank payments, dial 1-888-388-4751.