Capital One Credit Card Complaint

Capital One Credit card department,

Unsolicited issuance of credit card New York

Capital One Bank sent me - credit cards under my account, - for me and - for my spouse. The card for my wife was never activated and never used. My wife has her own card with Capital One. Capital One creates a - account for her and sends her a credit card directly without notice to me. Thus, she has - credit cards from Capital One : - of her own and - to me. She incurs - charges totaling $400.00 on the - card I know nothing about. -, How can Capital One hold me responsible for her charges on a card I never authorized or had any knowledge of?