Hi @Natalie1990
To be charged nearly £100 per month for NowTV Passes sounds to me you have created multiple accounts.
Maybe start off by clicking on the "Find Your Account" green button on this linked article below.
https://help.nowtv.com/article/find-an-account
I would also go into the My Account section of all your NowTV boxes and any other playback devices you have used to see what email address or username used to see if they are all the same.
Also i would check for any NowTV email correspondence on all your email addresses you have ever used for clues.
Apart from that get in touch with NowTV live chat (click on the green chat online button in this link page below).
https://help.nowtv.com/article/how-to-submit-a-complaint