BookMyOffer.com / Saturday Sunday Media Internet — Battery bank

Address:	Gurgaon, Haryana, 689623
Website:	Bookmyoffer.com/Saturday Sunday media

I ordered a powerbank from the website after seeing and offer of 20000 mah at 300 Rs, but when it arrived, the final amount was 548 Rs. It weighed far less than its mentioned capacity, so I opened it and found out that it had only one cell, the rest were some hardened materials made from rubber I think, to give weight to the product. It's totally fake, and I lost all my money. I asked the DTDC courier service that I collected it from, if I could open to check for its genuineness, but they said they would not take back such a product. So I had to pay the money and then open it, so am left helpless. Help me somehow.