Complaint Review: Zoosk Inc

On November 2010, I saw Zoosk ad on my Facebook that offered a very cheap membership for USD 5.25 for 6 months, so I subscribe. I ended up rarely used the service because I found it very ineffective, but I thought it the membership would end soon anyway on May 2011, so I never open the website during the time. That's why I'm very surprised when I received a credit card billing for USD 52.50 for Zoosk service, despite it has ended. I contact the Customer Service, but it was useless. I only received an email stating that they have automatically renew my membership. I was shocked to learned that they had used my credit card information without my authorization and charge me ten times the price I paid when I first subscribed.
I contacted my bank, and they told me to fill the dispute form, and I have to cancel my credit card to stop Zoosk from charging me with the subscription fee.