For the availability and prices of the spare parts, we'd suggest you to connect with the nearest authorized service center. Click on the link and select your desired city for [service centers@https://www.cardekho.com/Tata/car-service-center.htm
It would be unfair to give a verdict here as the Tata Hexa is not launched yet. So, we would suggest you to wait for the official launch and stay tuned for future updates.