My Moto G 2 has turned into a TorchLight.

I was taking a photo from my Moto G 2 and I turned the Flash Light on, but after taking the Photo, the flash light remained ON. I closed the Camera Application but still, the Flash Light was ON. I switched off the device and guess what, it was ON even then. Then I restarted the device but the flash light is not getting close. What to do. It is ON all the time. It looks like I haven't bought a phone, I have bought a torch Light.
