Are you sure that there is no other account on which this card is being used or if any family member is using it. The only option here is to work with the support team and your bank to get this sorted. If this is some fraud then you will need to block the card through your bank. Talk to Adobe support first to see if they can give you details that help you track this down
To contact support, login to your account and navigate to the URL below. Make sure that the browser has cookies enabled, and all script blockers are disabled.
Type AGENT to avoid bots and talk to a human.
Also, be mindful of answering anyone who sends you a private message. See the following for more information about scammers