Bogdan Roberts, Credit Cards Moderator
@bogdan_roberts
A Capital One credit balance refund is a reimbursement for paying more than the total balance owed on a Capital One 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 Capital One credit balance refund by phone the number on the back of your card or by sending a written request to:
Capital One
Attn: General Correspondence
P.O. Box 30285
Salt Lake City, UT 84130-0287
Capital One cardholders can get a credit balance refund in the form of a check.
Note that you are not required to request a credit balance refund if you overpay your Capital One credit card. You will have a negative balance on your account, so your future purchases will be credited until the balance is back to zero. And if you maintain a negative credit balance for six months, Capital One is required to offer you a refund.

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