Error in process of refund by department

I have Claimed refund from cash ledger which was rejected by department for not filing of monthly return. later on appellate has set aside rejection order. Due to non availability of online module for appeal effect I have filed rfd 01 again on 29/4/22. Now department has passed order in my favor but in place of rfd 05 they issued PMT 03. The refund is not credited in my account instead my credit ledger has credited with refund amount. Now the officer don't know how to correct the mistake. he said file DRC03 and reverse the credit. and for refund he says dekhte hai. My original application was of Jun 21 and its Jun 22 and the refund amount is 20 lakh.

what actions can be taken and am eligible for interest from which date.