
If you have made up your mind to close your Capital One credit card, nothing should stop you. However, you should think it through to know exactly why you want your credit card account closed. Perhaps you are uncomfortable with the continued payment of the high annual fee. Or you are struggling to make payments on your credit card. So long as your reason to cancel the credit card is good enough, go ahead and do it.
You can cancel a Capital One credit card in three ways. These are discussed in detail below:
Ways To Cancel A Capital One Credit Card
Online Capital One Credit Card Cancellation

If you are not ready to talk to a Capital One sales representative to cancel your card, the easier option is to do it online.
The following are the steps involved when canceling a Capital One credit card online:
Cancel A Capital One Credit Card By Phone

One of the reasons the credit card companies insist on you calling a phone number to cancel your card is so that they can convince you otherwise.
However, if you have made up your mind to cancel your credit card, don’t be afraid. The Capital One customer service number is found on the card at the back.
Alternatively, you can get this number on the Capital One ‘Contact Us’ page. Your monthly statement also has a phone number.
The Capital One customer service number is 1-800-CAPITAL (1-800-227-4825). If you want to expressly talk to a customer service representative, you should press 0 in response to each and every one of the prompts.
Don’t forget to request the representative to report to a credit reference bureau that you requested for your account to be closed. It should also be reported that your account has undergone a ‘hard close’ to prevent future changes to it.
Write a letter as a follow-up. Capital One will reply with a confirmation that the account was actually closed.
Close A Capital One Credit Card By Mail

The last way you can cancel a Capital One credit card is by sending mail. You will find the Capital One mailing address on any paper statement at the back.
You may also get it on the Contact Us page of their website or as below:
Capital One
Attn: General Correspondence
P.O Box 30285
Salt Lake City, UT 84130-0285
In the letter, you may state the reason you want your credit card canceled. It is also important to request Capital One for a written confirmation that the card was actually canceled. Make sure you give your name as it appears on the card and your credit card account number.