Adam McCann, Financial Writer
@adam_mcan
A Citibank credit balance refund is a reimbursement for paying more than the total balance owed on a Citibank credit card. For example, a cardholder who has a balance of $500 but pays $600 can get a credit balance refund of the $100 that they overpaid.
Cardholders can request a Citibank credit balance refund by phone (1-800-950-5114) or by sending a written request to
Citibank Customer Service
P.O. Box 6500
Sioux Falls, SD 57117
Citibank cardholders can get a credit balance refund in the form of a check or an ACH refund credit to the bank account from which the payment was originally taken.
Please note that you are not required to request a credit balance refund if you overpay your Citibank credit card. If you have a negative balance on your account, meaning you've paid more than you owe, future purchases will be credited until the balance is back to zero. If you maintain a negative credit balance for six months, Citibank is required to offer you a refund.

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i recently found an unopened citibank envelope from 2017.. Inside was a refund check for my account balance. The check has of course expired; I wonder if I still have a right to the money? It was $100.