Flipkart — Cancellation of order without any explanation

I order 55 inch Android led TV from Flipkart. It's listed price 50999. But I order it on 47790 with multiple discount coupon and payment done by debit card but my order is cancelled after ten hour without any explanation. They said your money will be refunded on 3rd November after 6 days of my order. The same led is listed on the Flipkart after cancellation of the led TV. If my order is cancelled due to some reason why it is still listed on the Flipkart. When I talked to customer executive about this they disconnected my call. This is totally fraud . They are not selling the product. They collect money from different customer through prepaid transaction and use it for their profit