Chip Lupo, Credit Card Writer
@CLoop
To cancel your Credit One credit card application, call the Credit One application support department at (800) 752-5493 as soon as possible. Online applications begin processing as soon as they’re submitted, however, so it’s highly unlikely you will have enough time to call and cancel the application successfully. Credit One does not allow you to cancel an application online.
Once the application is processed, you won’t be able to cancel it, meaning you will have a hard pull on your credit report and a slight decrease in your credit score. And if you cancel the card after the new account is reported to the credit bureaus, the account will still show up on your credit report.

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Compare CardsMark Stam, Member
@markstam
You can cancel your Credit One credit card application by calling (800) 752-5493 from 5 a.m. to 9 p.m. Pacific Time, Monday - Friday, and 6:30 a.m. to 5 p.m. on Saturday and Sunday.
Closing a new credit card account isn’t likely to have a major or long-lasting impact on your credit score.
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I have been trying to cancel my Credit One cards (2) but all the numbers including the one you posted does not reach a real person, it just has me going in circles. Is there an address where I can send a written cancellation or email, because the automated system doesn't give me an option to cancel.