Hi Nachiket,

If your blue tooth headset is getting detected in the device manager, then you can try to make headset as you default device and check if it works.

Fix 1: Make default option

1. Click Start, type Sound in the Start Search box.
2. Click Sound in the search results at the top of the Start menu.
3. Click the Playback tab. Notice the check mark next to the default device. For most users, the default device is head set. 

Make sure that your audio settings are configured as expected. Follow these steps:

1. On the Playback tab, select the playback device, click Properties, click the Advanced tab, and make sure that the Default Format is set to the value that you expect. When you finish, close this window to return to the previous window.
2. On the Playback tab, select the playback device, click Configure, and then make sure the configurations are set correctly.
3. Select the sound device that you want as the default sound device, and then click Set Default.
4. Click OK to save your settings and to close the Sound dialog box

Fix 2: Update the drivers
Though you have updated the head drivers, I would suggest you to uninstall and reinstall the drivers from the manufacturer’s website.

1. Click Start.
2. Type devmgmt.msc in the start search box and press enter.
3. Right click on the head set driver and select uninstall.
4. Download and install the drivers from the manufacturer’s website.

Fix 3: Check configured services in your headset

1. Go to your Bluetooth icon left click it menu will open. Go up click Show Bluetooth devices left click it now your in the Control Panel\Hardware and Sound\Devices and Printers.
2. Place your device in pairing mode and hit Add a device when you see your device click on it to add it and the drivers.
3. After your drivers have installed, go Back to Control Panel\Hardware and Sound\Devices and Printers and right click on your bluetooth headset.
4. Go down to properties left click. Now your in the headphone properties go over to Services left click it.
5. Now click or highlight these boxes: 

• Audio Sink
• Handsfree telephony
• Headset
• Remote control
• Remotely controllable device

After highlighting or checking these boxes click Apply and more drivers will install after drivers finish.
Now Reboot your laptop.
On some headphones there might be more options, so check for them as well.

I hope this helps in getting the sound in your bluetooth headphones.

Regards,
Lokesh