@oldJane
You will have an account, for Now streaming, which is not the one you know about.
There are several ways this can happen, ranging from the sinister to the harmless.
You should contact Now via Live Chat, as I describe below, and have them sort this out for you, including refunds.
If they won’t refund every month since March, contact your card issuer to see if you can get a chargeback for the remaining balance. This, again, may depend on the exact circumstances here.
The following link leads you to direct contact with Now (via a tiny green circle with a v in it, so keep your eyes peeled for that, when you have made your initial choices):-
https://help.nowtv.com/article/how-to-contact-now
Avoid ‘Get Help Quicker’ there; the Nowbot, while it means well, doesn’t know its own limitations, and it won’t help you once you get to this stage. Also, don’t choose Request a Refund, even though that is something you want, as that will only deliver you to the Nowbot; pick something else relevant to this, like getting that rogue account closed.
Depending on the root cause, they will likely have some advice on how to guard against a recurrence.
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.
