Issue related to GST Refund wrongly rejected in entirety by the officer by mistake

GST REFUND for F.Y. 2017-18 applied under "inverted tax duty" in June/July 2018.

In RFD-08 (at Aug'18) Refund for "input availed on capital goods" was "rejected" where as "input availed on raw material" was accepted.

ENTIRE money removed from electronic credit ledger during application of refund (Jun/July 18) was returned to our electronic credit ledger on Mar'19.

Refund accepted by department was also wrongly re-credited to our electronic credit ledger (Mar 19) along with the disallowed claim of input claimed via Capital goods instead of giving refund in our bank account.

Now we are not able to claim refund under inverted duty tax for 2017-18 as a refund application for a financial year under a particular head can only be claimed once.

Even officer is not being able to process the refund due to us as the file was erroneously rejected from his end in entirety.

Please advise the remedy available to us.

Regards,