Branded optical fiber connections are different compared to PSU/Government-owned fiber companies bro. Railwire and BSNL are not good, I can not deny that. I have also used them in the past and wasn't satisfied.
If you get Airtel and Jio optical fiber, you will find they are way stable compared to their AirFiber. Almost 98% link uptime Airtel Fiber has and JioFiber has 100% uptime, unless there's a fibercut which hardly happens once in a few years these days due to their strict monitoring.