I was a customer of bsnl broadband. It is a bit costly and it gives very less limited usage per month but it is a very stable connection. I agree that sometimes the server is down, but if your plan is of 1mbps bandwidth, then it will be around 0.9-1 mbps only.
You can trust this isp and it is far better than the private internet providers. The new fiber optics connection is very costly but the speed that provides is amazing. You can give it a try.