several things to try
- Use the 'fogot password routine snd enter the current pass word--no go?
2-- ditto above create new password- observe the capitals and numeral use rule-- must include both. any joy?
Go through the restup routine - Email/phone number/post code/mothers maiden name/ follow the links --no luck?
3 Go to BT home click on my BT click on live chat- do you know how to use that ?
The helper [in Delhi] will talk you through a resetup.
They will ask the same questions as above and when all is done give a tempory psswaord which you can keep or chane for a BRANDNEW one dont refer to anything used previously.