You need to be careful when you do things online. Usually when something sounds too good to be true it usually is.
I work for a bank in the fraud and dispute department and we see disputes for charges like these every week. What people need to understand is, most of the time you don't read the terms and conditions, in there it says that you will be charged monthly, you also sign up for their website, and you get charged for that as well.
You can buy ACAI Berry at Wal mart, at GNC, so buy it there, not online. Its common sense, if you put your card number out on the internet, its possible that it can be stolen from that website.