Volkswagen India — Issue in gear box

Hello sir,
My car no. GJ08AJ9501 is at your Mehsana workshop and the amount to fix is something around Rs 150000. Why should I pay this much amount of money in just 4 years or just 70000 km. when we had service done just on 16/07/2022 at your Ahmedabad workshop.
Pls resolve our issue as soon as possible. Pls see if you can do something for us because the amount charged is too high for us. Thank you.