Dealzkart — Samsung power bank and sony headphones

Website:

Dealzkart.com

I have purchased combo pack of samsung power bank and sony headphones but when i recieved the product .i found both things are duplicate and even non working condition.They have written that power bank will be 25000 mah but it not even 1000 mah and headphones are also of some local brand which does not even exist .How can they do this.please do the needful against them and provide suitable justice to me.