Amazon — Not delivering the product on time after taking the payment

Address:	Bangalore, Karnataka, 560055
Website:	www.amazon.in

I purchased a exide inverter batter worth Rs.11000/- on 28 April 2016. Amazon told me the delivery to be done on or before 18 May. Till date my product is yet not delivered to me. When i contacted them many time, they cancelled my product without asking me and refunded the money to me after taking money after a long time without any interest. Neither i get the product nor i get any a single penny interest. I want your favor that for such a big brand in India, they have no value for their customers, if it is possible, please impose penalty on Amazon. I am attaching the documents related to payment and the courier details.