Myntra.com — refund not received from myntra after returning product

I purchased a product worth 1368 from myntra and had to return it due to certain issues. I recieved a message of refund initiation and was told to wait for 10 days but nothing happened. Bank denied any such transaction. I have complained 3 times to myntra helplinr but they are denying any help. Its been 3 months now since i returned the product. They are wasting my time for so long without any help