Siemens C2110 — 691 error

i am under habra telephone exchange north 24 pgs. west bengal.
my land telephone no :[protected].address 378a/1 ashoknagar. 24 pgs (n) west bengal.
last five days i can not work internet due to 691 error code.
jto of habra say it is password problem, please you contact jto mr. gupta phone no [protected]. after that i try many times again & again but there was no reply. now i do not know, what i will do?
so please help to me about my internetconnection service.
with thanks, g k majumder
enclo :-
customere no :[protected]
portal user id : gop [protected]
order id : 1818520
date o[censored]ser creation : 01/08/08
registration no: AKN/A1200-UF / 2008/0137 . DA