Flipkart — self cancellation of order

Address:	Bangalore, Karnataka, 560029
Website:	flipkart

I had placed the order on 15/12/17. Order includes samsung on nxt, back cover, and uni-stuff tempered glass and is expected to deliver by 18/12/2017. Total amounting worth rupees 17000 but on offer it is 11041 payed through hdfc credit card in the offer period. But without informing the order is self canceled. Provide me the justice.