Myntra.com — Order cancelled automatically which was on sale

I ordered a t shirt from Myntra week ago it was on sale and my total bill was 229/- and I saved 800/- I was happy to see how Myntra was selling anything this cheap and expected delivery date was 19th October and unfortunately the delivery delayed and today when I checked the delivery info I found that it was cancelled they were saying that...

"I checked the records & I am sorry that the specific order was cancelled due to unavoidable reasons. Unfortunately, this action cannot be undone at the moment.You can always place another order from our App/Website to get the items again."

But now I will not get that tshirt in that price again it was not my fault at all why they have to sell something if they don't want to deliver it

My Order ID # 1249058