To cancel a PAN number that has been compromised, you need to follow these steps:

1. Report the compromise: Report the settlement of your PAN number to the Income Tax Department of India. You can do this by calling the PAN centre or emailing the Income Tax Department.
2. Submit a written request: Submit a written request to the Income Tax Department to cancel your PAN number. Your request should include your full name, date of birth, PAN number, and a brief explanation of why you believe your PAN number has been compromised.
3. Provide supporting documentation: You may be asked to provide supporting documentation, such as a police report, to support your request to cancel your PAN number.
4. Wait for the outcome: The Income Tax Department will review your request and inform you of the work. If your request is approved, your PAN number will be cancelled and you will receive a new one.

It’s important to note that canceling a PAN number is a serious matter and should only be done in extreme cases where your PAN number has been compromised and cannot be used safely. If you’re not sure whether your PAN number has been compromised, it’s best to contact the Income Tax Department for guidance.