Magic Jack Unauthorized Charge on Unauthorized Credit Card $400.00 West Palm Beach California

I was notified by my credit card company of possbile fraudulent activity. It was a $400. charge from magic jack. My husband and I were notified by magic jack that we needed to renew or our service would end (almost a year ago). We did not renew our service and switched to another phone provider. We even changed our phone number. Now, almost a year later, we are charged $400 to a credit card that we have not used in years and had never authorized magic jack to charge. 

When setting up magic jack, we authorized them to charge our American Express card. We never renewed with majic jack and have not been customers for almost a year. Now our Bank of America credit card that we don't even have, use, and never authorized magic jack to use is charged $400!!!