Under which section/circular/rule I can file for revocation.Registration is cancelled on my request.

If your GST registration has been cancelled at your own request, you can file for revocation using Form GST REG-21. This application must be submitted through the GST Portal under Services > Registration > Application for Revocation. It's crucial to note that this is only valid if you apply within 30 days of receiving the GSTIN cancellation notice. Visiting the department office is also recommended for assistance.