TATA Indicom Plug 2 Surf — I am not able to connect online to surf net

Address:

Ghaziabad, Uttar Pradesh

This is my nubmer [protected] with which I am facing the issue.

My contact number is:: [protected]

Please read issue carefully.
I purchased a new prepaid connection on 2nd July 11. I recharged my mobile number by 125 (1st recharge), 94 (2nd recharge), I surf Net for 3 days. But on 4th day, I started facing the error number::
691: Access Denied because of Invalid Username and Password for this Domain.
I started contacting to the customer care using number::
[protected], they referred me to 12524. I also tried contacting using
[protected]. They suggested me to contact back to [protected]. And never help me. I could try the
"EXTRA INITIALIZATION COMMAND" But I dont have this. So , I cant try it.
Please help me. No-Once helping me out. I also tried my Plug 2 Surf on different system and also tried my Dongle after re-installing my Operating System. But this seems that there is an issue with this mobile internet account. I am not able to establish the connection by logging. because the Username and Password is invalid. I used to dial the number #777 and the user name was "INTERNET" and password was "INTERNET". because I used the dial to do this, i also tried to create a dial up connection. But, no-one helping me out.