Myntra.com — Myntra Product returned no refund received

Address:	Sector 37c, apex our homes, gurugram
Website:	Myntra

Hi
I have ordered one black color rib dress in which I was having size problem so I put in exchange for size and after exchange I received dress in maroon color with different style which I didn't liked so I decided to return, this dress I returned with Tokyo talkies tops in white and rust color, I received returned msg for tops but didn't received returned msg for ribbed dress. App is showing ribbed dress status as out for pick up since more than a month and Myntra agents are saying they didn't received product.
My question is if dress has not been picked from our address why didn't delivery agent came to pick from more than a month .
Myntra agents are asking me for return I'd which I didn't received and delivery agent didn't update return status in their system and because of their mistake I have lost product and money both and Myntra is not agreeing to refund money back now.
In this situation we can trust Myntra any more.