Hi and welcome to the forum @Anonymous User,
The good news is, if you cancelled your NOW TV subscriptions, NOW TV would have sent you a confirmation email of your cancellation request(s).
Provided you still have the cancellation email, claiming back any money NOW TV have taken in error should be a straight forward procedure by contacting a NOW TV representative.
If you don't have a confirmation email, provided you have not viewed any content (which the NOW TV people will thoroughly check) you should be able to get all (or a proportion) of your subscription payments returned/refunded to you by contacting a NOW TV representative.
You'll find it easier to contact a NOW TV representative via the forums 'Live Chat' facility or 'Send us a message' facility by using a Windows or Mac computer, not a mobile device, as their web browsers might not sophisticated enough to display 'pop-up' windows (ie: windows within windows). Also, Mac or IOS device users might require JavaScript support enabled in their Safari internet browsers. Here's what you need to do: -
EDIT: By-the-way... The official way to cancel your NOW TV subscriptions is by accessing the 'My Passes' area of your 'My Account' 😉
Cheers