Here are the steps to cancel your Chase debit card:

1. Call Chase customer service at **1-800-935-9935**.
2. Follow the prompts to speak with a representative.
3. Provide your account information and request that your debit card be canceled.
4. Confirm that your debit card has been canceled.

If you prefer to cancel your debit card online, you can do so by logging into your Chase account and following these steps:

1. Log in to your Chase account.
2. Click on the "Things you can do" menu.
3. Select "Replace a lost or damaged card."
4. Follow the prompts to cancel your debit card.