Flipkart — Product got auto cancelled without any notification or me cancelling it.

I had ordered PUMA Comfort Wns Slipon V2 Walking Shoes For Women (Blue) for my mother few days back and they got cancelled without any notification to me. I need to know why they got cancelled. I ordered them during big billion sale on discount and not the price has become more than doubled. Also, I reached out to my Flipkart Customer Support multiple times and had conversations with their support executives but all of them disconnected the call without providing any support.