Umesh Kumar v. State of U.P concerned the cancellation of the petitioner's GST registration due to failure to file returns on time. The petitioner deposited outstanding taxes in 2021 and filed for revocation of cancellation, which was rejected for being filed too late under Rule 23. On appeal, the High Court found that once all taxes were paid and returns filed, the registration should not be obstructed. As the petitioner's claims regarding tax payment and filing were not denied, rejecting the revocation application solely due to delay was not sustainable. The High Court held that the department and appellate authority orders rejecting revocation were unsustainable in law.