Myntra.com — cancellation of order and fake promise

I ordered a saree on one of the discount sale time for rs 754 (Inclusive tax) and the estimate delivery time was almost a week and 3 days. When there was still 3 more days for the delivery the myntra team cancels the order without intimating me and i get to know about it when i get a cancellation mail. I immediately checked on site to see what happened, i see the product is still available with a higher price where as my order was cancelled stating product out of stock.
When i called the customer care number a lady by name prachi answers saying there's nothing she can do but give me a good will coupon for which i have to shop for 1000 to get 400 off. I tried using the coupon for the same product but it gave me a error saying that this coupon is not valid for this user if it had told not valid for selected product i can understand but it said invalid for this user.
I called the customer care number again and this time guy named manish gulati picks up the phone and after listening to whole issue and unable to convince me that the product was actually out of stock he promised to deliver me the product i placed order for the sale price for which i gave appreciation for him to his manager. After 4 days i don't see any progress though they promised the issue will be taken care in 2 days.
Now i called the customer care number again and this time a lady picked up to say all the promise made was fake nothing can be done to the cancelled product and that they can't help me much n will look into the coupon issue, she even said may be in one of our warehouse the product went out of stock. I said i placed order with myntra n not with ur particular warehouse. Basically mytra played a sale gimmick n cancelled the order so that we place the order for the same with higher price as we have liked the product.. U have a good name pls stop playing such cheap sale game with customers.