@Anonymous User
If you have ever logged in to Now on a TV, app or stick, or someone else with your account details has, and you didn’t set a Payment PIN on the account, then anyone using that TV, opening the Now app and selecting to watch a programme, will start the subscription up again.
Could this have happened? Four year olds can manage it apparently…
Run your old account up again and look under Manage Account/Devices to get a clue to what might be in use.
There is more advice here:-
https://help.nowtv.com/article/cancelled-but-still-being-charged
It talks about Cancelled accounts, but it pretty much applies to live Accounts where all you have Cancelled is the passes, as well.
Set a Payment PIN on your account so that no-one but you can buy memberships on it.
Check your bank accounts monthly for any other unexpected payments to Now.
That way you can at least nip them in the bud, while you and Now figure out whose fault they are.
