Originally Posted by RaiderCash_Dominik

Not much you can do. Using their billing information can be illegal and they can always say it was unauthorized usage and come back at you.
The worst one I ever had was some guy from Maryland emailing off the bet about problems with video size, format, log-in and so on. I took it lightly first two month but when he emailed me 90 days later and told me that "everything sucks and I am filing charge back", I emailed him his download stats for each day of 3 month he was a member (it was like 4 terabytes), he replied "I am deleting it as I am writing this email". Needless to say he never filed chargeback and stayed as paying member.