If you notice suspicious activity on your Chase account, please follow these steps: 1. Contact us immediately at 1-800-935-9935 or visit any of our branches as soon as possible. Our customer service representatives are available to assist you 24/7. 2. Provide the necessary details about the suspicious activity, such as the date and amount of the transaction, the type of account affected, etc. 3. Request for a temporary freeze on your account to prevent any further unauthorized transactions. 4. Follow our guidance on the next steps to take based on your specific situation. This may include resetting your password or enrolling in additional security features like two-factor authentication. 5. Keep track of all correspondence and notes related to the incident for future reference. Remember, Chase is committed to protecting your accounts and will work with you to resolve any issues.