Jiomart — Order cancelled by jio mart

I bought a product yesterday after providing my pin code, after 28 hrs I got a message telling refund is processed. if they can't provide the product then why the product is listed in the app/site even after I provided my postal code, this is not the first time I am getting this refund . if they have shown, the item is unavailable on the site itself I would have bought it from somewhere else in the meantime. I have lost my time waiting for this.
actually, this is a type of cheating first show all products so everyone will purchase from them then they cancel eventually.