Indian Overseas Bank — refund related to myntra.

So, sir/mam i purchased a pair of shoes from myntra on 8 december. And i made the payment through cod. But then as i found some defect in the shoe i returned it and asked for a refund on my bank account but as the system was not accepting my sbi's account so i gave my roommate's bank account details of indian overseas bank. But when after five days he didn't received any refund i tried to contact myntra and as per myntra, they had refunded the money from their side, but the amount is still not reflecting in his account and when i complained this to myntra, they gave an reference number and asked to contact the bank support team and when my friend tried to contact the costumer service, they asked him to contact the branch officers, but when today he tried to contact the branch and tried to show them the mail they refused to locate it by saying that there is no mention of our bank name and told me to tell myntra to mention their branch name and send a mail again. So its an request please help me. Reference no of the refund - n[protected]. The account no - [protected]. Ifsc code - ioba0001840. Please contact me on [protected] or [protected]@gmail.com