Enable Vodafone Volte On Max pro M1

I have This particuler problem of VI volte is not supporting on my device (Zenphone Max pro M1) but other providers Volte is working properly and even i tried other devices for VI volte workded fine. I have android 9 original.Please fix this problem ASAP
See Vodafone volte is not showing
And Airtel or Jio volte is working properly
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Comments
Hi there, we have made a note of the feedback and will share it with the relevant team.
VoLTE on VI network is already enabled on Max Pro M1.
https://www.myvi.in/vi-volte-4g-hd-voice-calls#:~:text=how%20do%20I%20use%20Vi™%20VoLTE%3F&text=For%20Android%3A%20Settings%20->%20Mobile,->%20Turn%20on%20VoLTE%20call.
If you are not on the latest version try to update your device.
Else, contact VI customer care. Call 198.
No its not VI problem.I tried this sim on other phones and there VOLTE worked properly.
Please Team ASUS, Give me a solution ASAP.
VI volte is working properly on my phone.. are you on latest stable 087 firmware!?!
Yes it's 087. But why mine isn't working ? Are you using the same firmware version ? And please If you find any solution let me know.
When will I get any reply ?
I am already done with reset factory setting and nothing solved.
Asus already activated VOLTE for this device and works fine with VI sim card.
It might be the SIM/Network provider end issue. You can try to reach VI customer care and ask them to activate volte by mentioning your device company model details. They will activate/ if it not getting then you have to replace with new SIM card from your network provider.
Even if not working, you have to visit nearest Asus service centre to get help with your problem since, device software already supports the VOLTE and you are in latest firmware.