Maruti Suzuki India — Brake booster for my maruti automatic car

We have maruti automatic (AT ABS) car. Recently we face some problem with brake booster with Master cylinder of our car. We tried to fix the issue by taking our car to several maruti authorised service stations but they couldn't help with this problem. After that we sent mail to your maruti company but they didn't even respond yet. We have paid maruti lifetime road tax and our car hasn't even crossed 10 years yet. So if the product is not available in the market then it's your company's responsibility to find the same and help us getting out of the issue.