I had an account with BT with Now linked fine but closed that BT account and now made a new account. I can't access now tv now and the email linked is wrong, I don't have access to that email to log in or change details.
I’m going to be vaguely puzzled as to why you made a new account with an email you can’t access - typo maybe? - but follow the advice in this link:-
You will need the bit on that page where you contact Live Chat and ask them to unscramble this for you.
There may also be a complication where you perhaps weren’t unhooked from BT TV properly, but Live Chat should also know how to advise you if that is the case.