When you signed up for NowTV Broadband you didn't setup a new account by any chance, where the Cinema pass would be on the other account details?
Is there any mention of your cinema pass under the My Account > Bills & Payments section when looking at the previous payments over the last 12 months whilst logged in on here ?
Perhaps contact live chat where they can delve into your account in more detail.
Open the link page below and select the most appropriate help topic then once you get to the final stage scroll down to the bottom of the screen page where hopefully you will find Get in Touch.
Click the drop down arrow below Get in Touch to reveal the live chat button.