Reliance Jio Infocomm — Jio4Gvoice always showing offline

I won't receive the calls as Jio4GVoice will be offline always. Please update the firmware. I have buyed Vivo Y51L mobile and installed Jio4GVoice app. When I click on that app Jio will be online else it will be offline. Please help in keeping the Jio always online.
I have tried all the different ways but still problem not resolved. Some body told to update the firm ware. So Please update my Firm ware.

Thanks.
Archana N