BSNL — bsnl network problem

My name is mathew k thomas residing at singanallur, coimbatore and i have a bsnl prepaid mobile connection.in our home we are using 3 other bsnl connections also.
The last three weeks, we are facing calling and internet connection problem.
I have tried several times to call customer care officer. But no one pick the phone. Our problem is pointed below:
1. For connecting to any other mobile, we need trying to several times. Every time we heard a replay that all lines are busy, try after some time.
2. Now bsnl net connection speed is too low. It shows symbol ‘e’. 3 weeks before it shows h+ and the connection also speed.

When bsnl clear the problem.