Refund application for igst paid on account of export of goods

Dear All,

An exporter has made export with the option 'on payment of IGST'. in Aug & Sep 2017 He has paid IGST accordingly. He has opted quarterly return option accordingly for the Q2 he has filed the GSTR-1 properly by updating export inovice details in Table 6A in the month of Sep.

 Now when he checks the status of refund of IGST paid by navigating to // Services > Refunds > Track status of invoice data to be shared with ICEGATE // the below status is appearing.

Details not transmitted to ICEGATE – GSTR-1 not filed: Taxpayer hasn’t filed GSTR 1 for the corresponding return period. Please file GSTR1 of the selected return period

But actually GSTR-1 was already filed.

How to go about now??