There's a couple of questions I'd like to ask about your predicament:
1) When you first cancelled your cinema pass did you receive an email from Now TV confirming that cancellation?
2) You said, "i thought it had gone through as it was stated as confirmed on screen". Did you take a screen print of this?
If the answers to the above questions is "no" then get onto Now TV's help chat, first thing this morning, and explain what has happened, if they can confirm you, your family or friends have not watched anything from the Now TV's Cinema Section in the last six months then you should, at least. get some of your money back.
Use the following URL to contact help chat:
then click the "Anything else?" down arrow.
Hope this helps.