ITC utilized against Closing stock at the time of cancellation of gst registration

Hello sir/ Ma'am,

I had cancelled gst registration, at that time i had stock in house so i utilize my ITC against closing stock at the time of cancellation of gst registration.

Department send notice for clarification after 4.5 month and given 15 days time for reply. such time lapse and i can't reply on Or before given time period.

Department rejected my cancellation request. but such ITC utilized. at the time of cancellation will not reward back to my E-credit ledger...

is this a technical error of portal Or I hv to claim such amount in GSTR-3B?