BookMyOffer.com / Saturday Sunday Media Internet — I'm complaining about Samsung power bank

Address: Bareilly, Uttar Pradesh, 243122

Website: Bookmyoffer

Sir,
I buy a Samsung power bank from your site of 20000 mAh on 27 Jan 2017. It cost 548 rs .And within a month it is not working its ref no is [protected].
So plz tell me how can I return it .I also try to call you but it is not connecting plz respond me as soon as possible.