Oyo Rooms — No refund given pending since march 2020

It is really a fraud company, despite of more than 10 mails and calling on customer care no refund has been done yet and is pending since march 18th 2020. Amount of rs 1927/- is pending and they are constantly asking to talk to bank and saying refund is successful but there has been no credit of amount. Bank has said they don’t accept reference no more than 12 digits and not able to track. I am stuck please help and provide some solution