Reliance Communications / outgoing calls disconnected since 1st sep 2017

I am Ramanan (Reliance-[protected]) Coimbatore, Tamilnadu
using Reliance service since 2012 - Postpaid.
Every month i am paying the monthly bill regularly, but from 1st Sep 2017
outgoing call had been barred.
I have complained at Coimbatore Showroom (only showroom at Cbe - others all closed) daily sat at floor (they have not provided stool to sit) for two hours everyday but no response.
Now what can I do further? As outgoing calls disconnected i could not apply for Portability.
Today Showroom people told directly approach TRAI, but when gone through online no complaint facility provided.
Please anyone help to move further...