rip off!

I noticed a charge for $40 on my credit. I called the company to ask where it came from. I have been told that I signed up for an Online Movie website, which I did not. They tried to prove it by naming some of my personal information, like my hometown – and that was correct. Then they tried naming my IP address, which they could not name. I thought “I won”, but they kept saying “I signed up so I must pay”. This website is a fraud, and they got my credit card info from somewhere.