IGST Refund

Ruchita Parmar (14 Points)

13 August 2018  
One of my clients have made an export with payment of IGST(in March, 2017). I have filed GSTR1 and GSTR3B as required. The GST Portal shows that the invoice has been transmitted to ICEGATE. But when contacted to ICEGATE, they say we haven't received any data for the said SB.
No one (GST portal and ICEGATE) is providing a proper answer as to what is to be done.
What do I do now?