Well. Change your thinking.
It does work. Especially for bsnl, mtnl.
No, 9dB is not good either. Slight flictuation in line conditions will lead to.issues again. But if it works for you, well and good.
My internet seems to be working fine now with 9db SNR. I can now watch twitch streams without any buffering. Thanks for telling me about this SNR thing.
If any future problems arise with this 9db SNR, I will contact the customer support to fix my low snr. Btw do the guys at exchange centre have any knowledge about this stuff?