Xiaomi India — unavailability of spare parts at service centers

I contacted the service centers via call to inquiry if battery for redmi 2 prime was available or not, i contacted 4 service centers but in none of them was the item available, and when i contacted the customer care they asked me the job sheet number but they just act like a fool because i told them that i contacted through call since the service center is far away from my location, they still are asking for job sheet number. But my point is that spare parts must be available at the centers and when i queried about when it would be available again they just denied by saying it won't be available again.