If a phone Volume buttons doesn’t respond or work when pressed, then the volume buttons are faulty and needs to be changed, or fixed, you can temporarily manage the phone volumes through the phones settings, on the sound settings, or through third party apps like button savior app, volume apps, etc, which can be downloaded from the app stores,
Also note that you will need to change or repair the phone’s volume buttons, so you will need the service of an experienced phone repair engineer, you can click here to request for our phone repair service, because at Chrisrepair.com we offer swift and hassle free phone repair services.
Regards.