Paytm Mobile Solutions — unethical behavior, order cancelled days after sale without any reason

Website:

Paytmmall.com

I had ordered a sony ilce-6000l (With selp1650 lens) 24.3 mp mirrorless camera (Black) for the price of inr36760 on sale. The seller cancelled my order five days after the order was confirmed. The same product now costs inr43390. Had they cancelled earlier during the sale, i could've ordered it from elsewhere for lesser price. The order was supposed to be non-cancellable (Screenshot attached)