I got an email from netflix saying I've signed up to their streaming service. I have not. When I log in to the account they say I've signed up for it says it is being payed with via visa card, which I do not have. Am I being scammed in some way or is this just a mistake? I called visa and they told me there was nothing they could do if I didn't know the full card number. The only information of mine that was used is my email address. What gives here?