Hi @Anonymous User
Have you ever created more than one email account in the past to take advantage of nowtv trials or new customer offers ?
When you go to your account does the green apply voucher button still show next to your pass and if so have you still got the voucher code to try applying the code again ?
If you are still struggling then contact live chat, you can normally find live chat by opening any of the help article pages where there is a blue get in touch button shown somewhere on the page.
Here's a link below to live chat to save you time.