For making complaints for your MTNL landline or broadband
you can use
You can also use another MTNL landline to dial 1500 or 1504 or 198 or xxxx2198 where xxxx
is your exchange code. xxxx2198 will work from your mobile phone too.
You can also track your complaint thru http://mtnlmumbai.in/index.php/online-complaint-tracking