Corporation Bank — IMPS P2P transaction failed but amount is not credited back

IMPS-P2P transaction was initiated on 01/Feb/2021 for amount 10000, was failed. Reason for failure is not provided.
Amount in dispute 10000 is neither credited to beneficiary nor it is credited back to the originating account.
I have tried calling customer care number of both Corporation bank and union Bank and none of these calls were answered(Kept on hold for 20 to 30 minutes and never answered by customer care executive)
I reached out to near by Union bank branch, and they registered complaint on 09/Feb/2021. Complaint reference number is IMPS[protected]
I have been going to this branch to get the update on the complaint for last few weeks. Complaint status is "In progress"
I was told to contact the home branch. Home branch manager is unaware of the IMPS-P2P transaction facility and doesn't recognize the failed transaction.
I'm tired and exhausted by the number of follow-up a customer is put through, for no mistake of mine.

Could you please look into this issue and advise how I should proceed further.