Flipkart — product booked in big billion sale, never delivered (forced to cancel or pay more)

Order od[protected]
I have booked a nikon camera on oct 3, expected delivery oct 13. On 13th, they inform me, there is some issue. Please give us time till oct 16. On oct 16, they ask for time till oct 17. Then, till oct 18. Finally, they disappeared. I raised a concern on chat. She tell me, she can't solve it right now. They will call back in 24 hours. I managed to miss that call and called them back. Again response will be only in 24 hours.
Now, begins the real story.
Final settlement is to cancel the order. Place the new order at new price and new payment terms (Which of course does not include no cost emi). They will refund you the difference in the form of gift voucher after you pay and receive the new order. Gift voucher amount cannot be encashed in account and has to be spent within one year, only on flipkart.

@flipkart, why is this disappointing to me as a customer and i will not trust you again?
1. You are not giving me same deal again which is no mistake of mine. Issues with your sellers, technical glitches in website, if any, are your problems. Not mine as a customer.
2. You didn't even bother to follow up about a situation where you are failing to deliver an order until i followed up. Shows poor concern for the customers and their orders.
3. Your customer care is not at all cooperative and apologetic beyond the formal figure of speech. They are like, 'this is the system. This is the policy. We don't care even if you are customer. This is it. Take it or not. Your wish!'
4. When you have booked my order, of course i trusted you and did not place the same order with any other portal. Because of your failure to deliver, i missed the opportunity to order from any other portal. Clearly, disappointing for the trust shown your brand.
5. You have also blocked my money from my account for this period. So again, i could not place another order with you or anybody else because i my money is with you till you solve the issue. Was it planned?
6. Let me not talk about getting the frustration of all this instead of joy of buying a new product during biggest festival season.

Well done flipkart! Thank you so much.