Write an email to CMD and cc the email to other address :
Code:
CMD KULDEEP GOYAL cmdbsnl at bsnl.co.in
Public Grievance N.KUMAR ddgpg at bsnl.co.in
CGM Data Networks cgmdnw at sancharnet.in
You will definitely get a +ve response as I got similar problems resolved by reporting to the CMD and other address about night 2-8 bsnl broadband speed issues. Dont forget to mention your address and phone.
For starters you can read my letter to BSNL. 
http://www.indiabroadband.net/bsnl-b...ome-500-a.html (My letter to BSNL regarding Non Existant Night Unlimited 2-8 broadband in Home 500)