@ whizkins, you can try dropping in an email at deadsl@bol.net.in mailing on this ID was very effective when i had MTNL for getting speed, login issue's sorted out, do copy the mail to the gm/ceo etc and mention the compliant no's of previously lodged complaints as well.
The Network operations centre of MTNL broadband is Kidwai Bhawan, it would do you good to contact some broadband person there and talk to him regarding your problem, you should be able to find the relevant no's on the MTNL website.
Thanks a Ton! Cyberwiz. I am on mtnl's freedom 800 combo for last 2 months and never got full 2 Mbps (was getting around 1.6-1.7)as promised. Tried mailing everywhere from customer care to gm to even nodal officer but to no avail. Happen to read your comments and thought to give deadsl a try. Just took me 2 mails and those guys resynchronized my speeds to much higher levels ( these guys don't reply to mails but do take notice). getting over 2.1 Mbps constantly thanks to you. Great post