Myntra.com — Received wrong product and want to return it

Hey! I recieved a product(shoes) that is totally different form what I had ordered. And when I did a return policy the delivery/pickup agent told me to call on myntra and after approval he will pick it from me!
Now! When I'm calling on customer care no. The number is going invalid...so tell me where I have to contact.
This is really very disappointing.