I ordered pixel 10a mobile but they cancelled without a reason then with in a minute product price hiked 13k.

I ordered pixel 10a mobile which is 37989 after card offers and exchange old mobile but they cancelled without a reason then with in a minute product price went to 55 thousand and for my refund of that product i waited 5days because of that i couldn't order any mobile on sale now all mobile phone prices are hiked after 5 days of sale.so now what I am asking is i paid 500 rupees for flipkart black membership to get a best service and fast access to the product and delivery but nothing went on my way.so who is responsible for this.