Got a MTNL broadband at my place in delhi and from the day 1 i am facing disconnections. I have tried with linesman even with the SDO but nothing has been done.
First, have you registered a complaint with MTNL 198? Do you have a docket number? If not, do so repeatedly, every 24 hours (if your complaint number is vacated without resolution). Keep a record of these numbers. When you have 3 or 4 dockets, and your complaint remains unresolved, email your local exchange GM, with a cc to GM Broadband (you'll find contact details on the MTNL site), quoting all your docket numbers and ask for immediate action. Follow up, if required, by calling them. Your issues will get resolved.
You see, if you press the wrong buttons, you won't get any resolution. And requesting linesmen is certainly not going to yield any results as far as broadband is concerned.
Registering a complaint with 198 is important, as your complaint is computer-logged. And complaint logs (including time taken for resolution) have to be submitted to TRAI. If mandated timeframes are not adhered to, TRAI takes the service provider's happiness.