Have the exact same issue. Seems there is an issue with their website, just getting a blank white screen when it should provide confirmation of order. I too have been double charged due to trying twice. How do you contact this mob as there is no contact us number anywhere...
@Anonymous User
https://help.nowtv.com/get-in-touch
First choose 'NOW TV account & payments', then 'I have a query about my bill or payment date'.
Then there will be a get in touch drop down, which you would select 'broadband' or 'TV' for the live chat.
When I had broadband with Now TV, the number I used was 03300412460. Although not sure if it is still the same.
If it was TV you signed up for be aware there is no contact number.