soe commerce fraudulently accepted our credit card info from an unauthorized user Internet, Internet

my son played a clone wars game on the internet. he said if he bought a membership, it would be more fun.  we (parents) were very skeptical, but it was his birthday money so we said ok.  he wanted a lifetime membership for $50--we said," no try, the one month ($6) first and you can make sure you want to spend $50."  after about 2 weeks, we got info from our credit card and are trying to take action.  we have been charged $5.46 29x, $10.93 2x and $109.25 2x.  this was said to provide game cash in which he could spend to get more weapons...the girl i spoke with said she could not tell me exactly without the first 4 and last 4 digits of my credit card, which i did not give her (per advice from the credit card co).  they took advantage of my son by selling him things not worth their price and he is not an authorized user of our card.  they are taking advantage of unsuspecting people. our credit co is giving us info on how to dispute this.