Mivi — Refund for my order

Address:	Hyderabad
Website:	Mivi.in

I ordered a product from mivi which was defective and I was willing to return it so I made the company and ask the procedure they replied with ship the product to them in Hyderabad which costed me 120 rupees so I shipped the product to them waiting for the updates and reply but it's some month they haven't even replied me or updated me or not even picking up calls and also my refund is still not came in my bank account I need it please help.