Wrong Taxable Value, IGST Tax in Shipping bill-Refund not processed

Dear Sir,

We are having one specific problem in Shipping bill, while generating SB wrongly punched high Taxable value, Tax under Exports made under refund scheme. 

We noticed such discrepancy while filing GSTR1 return, we have filed with correct Taxable value, Tax, and intimated to CHA, he has given NOC from customs with having actual details of above Value,Tax.

till now we did not getting IGST Refund, SB000 - Successfully Validated found in icegate website.

How to resolve this issue, pl advice.