why my intex 4g LTE phone not show LTE/ Volte in status bar

[AC Question]

I have intex aqua super 4G LTE enabled phone. But in status bar only 4G showing.

In phone information settings "Turn Off VOLTE Provisioned Flag" is showing but this is not working, I think.

also, Enhanced 4G LTE Mode not show under Cellular network setting.

please give solution