Punjab National Bank [PNB] — Not getting my refund

I have shopped from a clothing site (myntra) worth of 719 rupees and return it on 9 feb till then its snowing process to my bank account.
Account no.[protected]
Name. archana gautam
Pin. 228001.
Branch. Sultanpur KNIT
On 21 February it should be credited to my account but till they are telling me that they had initiated my Account to the bank .I should contact to you i have mailed you several times but you didn't responded to my mail after applying in consumer complaint hope you refund my money and provide me genuine reason why you take soo long for this and why you were not giving any information about my refund.
Bank reference no - [protected](this reference no given by myntra)
Kindly you