Lenovo — network problem in lenovo zuk z1 while using jio

Address:

Coimbatore, Tamil Nadu, 641030

Call quality is very poor
No update until now
Phones under this price tag (Rs 8500, 9000) are using marshmallow but i bought this phone for 13, 500 i'm using the older version of android 5.0.1 lollipop this made the zuk z1 users sad
Update u can do it on
1) volte option
2) android version
3) cyanogen
4) flash light timing is not correct in camera
Please do this update as soon as possible this is our kind request by zuk users