@f0r3he4d I can't tell about BSNL as their people live in their own universe and they think they rule the world

...
My excitel connection power -
The physics those technical guys did to your connection is out of this world

.
I recently upgraded to 400 Mbps & I don't know whether it's co incidence or what by my power levels dropped to -10.4 from around -14 something.
That too when monkeys took a big swing on the cable and bent it and loosened it. I will go and fix it once the kite flying season comes which is just few days ahead. Anyways...
So yeah I'm sure that my power is even more than -10.4 (probably in the -9 range). Yet no problem in signal or anything. Getting 420+ Mbps download & 510+ Mbps upload (both touch 900 at first). I've never experienced any fluctuations etc. Due to it or power levels.
Just do one thing. If any problem comes in the future due to power levels or fiber core damage then just say to those fellow engineers -
Literally uneducated people in their field

.
As you said
"they asked the guy on the phone to drop the power making the reading -26dbm. i asked them why did you drop the power he said the
router will fry otherwise."
This statement is enough bro

.
Excitel works on same LCO model and if they start doing it then they are going to shut down their
business 
. Like majority of people want it to happen with excitel

. But until they're providing best power levels & speeds to customers like me. They're not going away anywhere anytime soon.
If you know what I mean

.
Anyways, hope it helps.