Punjab National Bank [PNB] — refund amount is not reflecting in account even after successfully placed from myntra

I had requested a refund from myntra to my bank account. After myntra initiated and transferred the sum in my account it isn't reflecting in the account. I contacted myntra customer care for the same.
They also gave me transaction id and asked me to contact bank. I'm not able to contact bank. Yet the money has not been received in my pnb bank account.
Kindly help me with that