When a country takes such hilarious and odd decisions then the population suffers. I have seen some friends buying bitcoins for over 900$ its actually around 60000 INR which means around $950 per bitcoins. The demand is more insane for cash deals.
How the cash deals can go forward, when the country is facing an acute shortage of banknotes? If you are suggesting that the buyer is purchasing the coins in exchange for the now-defunct ₹500 and ₹1,000 notes, then this is almost certain to cause issues to the seller.