Airtel — I'm complaining about network issue

Address:

700129

I have ported my number to airtel after checking so many claims to be the best network but unfortunately after i started using airtel my phone either shows invalid sim or emergency calls only.
I never get a stable network anywhere i go.
I have even checked by changing the handsets but nothing has worked.
I don't even have enough network stability to directly register complaint by calling at customer help.
This is very offensive.