Flipkart.com — order cancelled

Address:	Dehradun, Uttarakhand, 248001
Website:	flipkart.com

I ordered two honor 9n costing 3020₹ got confirmation message also, and a confirmation tweet from flipkart itself stating that order is approved by seller and will be delivered on 22 july 2019, but next day they cancelled my order stating that product was out of stock,
If product was out of stock how can i get the order confirmation, and how come seller approved the same,
I want my order flipkart is saying that they don't have to do anything with the seller, order was cancelled by seller so they cannot do anything, if this is the way what would happen to our money if seller denies to give customers money back. Flipkart is cheating on customer