If you know that other people have the card numbers on file, ask them to shred those documents and to not charge the account in the future.
In contrast, if you are just an authorized user, then the account will need to be cancelled.
When you are talking with the card representative, ask them to pull up the account on their computer. If they see any recurring charges, you should ask that these be stopped and cancelled as well. This is also the time to request that any late fees or charges be refunded. Most companies will be happy to do this after documentation is provided.
Make sure to also include your name and full contact information, so that the company will know who to reach out to when the cancellation is complete.
Never use your personal funds to pay off estate debts, unless you were listed as financially responsible for that particular credit card account.
