Exporter has to submit of Proof of Export like Bill of Lading/ Mate receipt or AWB, Custom attested ARE-1 etc along with the Annexure 19 to the Jurisdictional Excise Division.
Acknowledgement of Annexure 19 is treated as acceptance as Proof of Export.
To produce the BRC within 180 days from the date of export is not possible because of the receipt of Payment against the shipment under LC. It may take time.
If the division office is ensisting on this, then simply request them that this is not possible right now as the payment terms are like this (mention the reason ) and ask them to accept the proof of export based on the documents submitted by you and will provide the brc in due course.
R u availing any export benefits ?