@Anonymous User
Sounds like that you have got more than one username or Sky ID on the same bank card.
Your best option is to contact NowTV live chat, they will be able to look into your payments on their computer system.
Open the link below, click on "contact us" in the green box this will take you to a secondary page where there will be an option to speak to live chat or email them.
Recommend using a PC, Laptop or Mac when you contact them.
http://help.nowtv.com/article/None-of-the-above-manage-my-account
