It would be difficult to give any verdict on the service cost of Audi Q7 because it depends on various factors. We would suggest you walk into the nearest service centers. You can click on the following link to see the details of the nearest service centers and selecting your city accordingly - Car Showrooms.
Audi Q7 is already available for the Indian market and for the availability, we would suggest you walk into the nearest dealership as they will be the better person to assist you because it depends on their stock book - Car Showrooms