@Anonymous User Hi there. 🙂
Do you have another TV you could try the box on?
@Anonymous User Ignore my last post, I didn't see you already tried.
If you paid by debit/credit card, then that can be your receipt.
I would first see if live chat help:
https://help.nowtv.com/article/Troubleshooting-NOW-TV-Box-and-Roku
Click the link and then the green "contact us" button at the bottom. Then select "live chat".
Best on a PC/Mac.