Sony offers its 1 Year Manufacturing Warranty in India through its Authorized Service Partner Sony India. All you gotta do is make sure that the issue with your product is eligible for warranty claim. Please read this page thoroughly before contacting the brand.
Sony headphone Service Center
Service Partner: Sony India
Website: Warranty, Service & Repair Info
Nearest Service Center: Check this link and make sure that the service center closest to you can handle warranty for headphones.
Phone: 1800 103 7799