Bharat Sanchar Nigam [BSNL] — No internet service for 5-8 days every month

Address:

Bangalore Urban, Karnataka, 562125

I have complained for each connection and the response from customer care is that the issue will be fixed in 24 working hours i.e. 3 days.
I do not understand why my bill is not also generated for 31/30 days * 8 hours rather than 24 hours for 30/31 days, when you do not commit to keep the internet services up and running or at least start working immediately when the complain is registered.

I submitted a request about 2-3 months back to disconnect the connection via selfcare.sdc.bsnl.co.in and asked to tell me the procedure to return the phone and modem instruments. There has been no response till date and surprisingly the website is changed and there is no record of my account in the new website and even the request is missing.