For CSD availability we would suggest you to exchange words with the CSD staff as they will be the better person to assist you with the tie-up dealerships. Moreover, you can click on the link to check the nearest dealership.
The Tata Tigor EV XZ Plus is priced at INR 12.99 Lakh (ex-showroom in Guwahati).To get an estimated on-road price of the vehicle, you may click on the given link and select your city accordingly. [Price@https://www.cardekho.com/overview/Tata_Tigor_EV/Tata_Tigor_EV_XZ_Plus.htm
It would be unfair to give a verdict here as the battery life would depend on certain factors such as driving conditions, charging cycle, timely maintenance, etc.