Router suggestion for BSNL fibre

Try jio airfiber instead it is also good

https://www.amazon.in/TP-Link-Archer-C6-Wireles... best one i have this. 

I took a Syrotech 4 antenna router 3 years back, it is good but the 5g cover area is limited.

You mean you are looking for optical Fibre modem, right? Syrothecch is good enough and it will serve the purpose. 

Ask them fo basic ONT (which costs less than 1k) and you can use ur own router.

You may get all login details and use the ONT in bridge mode as well.

You may google this and check forums which has all details.

Get Syrotech dual band 4-antenna ont for ₹2348 on Flipkart 

https://www.flipkart.com/syrotech-sy-2010wadont...

For router you can use your old router or get a new one, preferably TP-link and connect via bridge mode. 

for my broadband fiber connection, I ditched ISP's Digisol DG-GR6821AC ONU router and instead got these two and things are running smooth :

https://www.tp-link.com/in/service-provider/gpon/xz000-g7
https://www.tp-link.com/in/home-networking/wifi-router/archer-ax10

Got both of them at a good price, so, didn't have to pay much but yes, it has been a costly setup

They took 5K for the basic Syrotech router 3 years back. Back then it was a monopoly in my area. 

go for jio bro. free router + you can have IP TV. in 598/month you get tv + internet.

you get bill payment offer on amazon. pay for 500 at 400.