Then you should take a better look. Each local ISP has their own self-designated territory or "area". They don't let any other ISPs establish themselves in their areas, beating them up or cutting their wires if they try - you can talk to any ISP technician and they'll tell you about it. 90% of the fluctuations in network are from a cable cut, often by competing agencies.
It's also one of the big reasons why AirFibre is becoming more prominent - can't cut cables if there are no cables.
The above commentor uses "mafia" not in the literal sense but he's talking about the mafia-like system where each ISP has territories they fight over.
Tbh, it's manageable in Bangalore, since the territories are already established and there's not much interference but much more horrible in other areas - we had to suffer with a shitty ISP in my hometown for years bc they kept cutting cables & bullying any other ISP that tried to come in.