Lenovo — Becoming worse

I am a user of lenovo k4 note.
I trusted lenovo for its features and build quality but later i came to know the truth.
I paid 12500 for my phone but it does not even have volte feature.
after updating it the volte feature has gone.Generally update means new features but according to lenovo it means update will reduce the features o[censored]r phone.
I mailed them my issue but the response was none.
There was no response.
I request lenovo to introduce volte feature in lenovo k4 note.
Otherwise i will not recommend it to anyone.i will make them to buy mi phones instead.