Zookr.in — wrong power bank

Address:

Bangalore, Karnataka, 560029

I have ordered a Mi Power Bank of 20800 mah, but they have delivered me a Samsung Power Bank of same mah. Moreover, this is a defective piece as I am unable to charge any of my phones. This was delivered by blue dart. I am trying to contact the customer care number given on Zookr but its not gettng connected. I have paid 800rs for this, and I don't know whom to contact for proper solution.