4cb68544__Capital_One___Credit_Line_FAQ__If_your_letter_says_
[What that means] When you requested a credit line increase, there was fraud suspected or confirmed on your account. This doesn't necessarily mean fraud occurred on your account. For your protection, Capital One won't approve a request for a credit line increase while there's a pending fraud investigation on the account. [What you can do] If you have any questions or concerns about your account, we're always here to help. Feel free to call us anytime on the number on the back of your card. We're available 24/7. [If your letter says:] 
A fraud alert internal to Capital One was on this account at the time of your request. Please call customer service for more information about the fraud alert on your Capital One account.
Credit Line Increase FAQ | Capital One - Credit Line FAQ
If your letter says: