WARNING--BEWARE!! These callers are B I G credit card criminals, known as the card service scammers. Under NO circumstances give these lowlifes your credit card number, or it will be regretted forever!
See http://800notes.com/Phone.aspx/1-305-368-8255 http://800notes.com/Phone.aspx/1-305-368-8508 and there are many other numbers under 305, 360, 407 area codes.
The card service scammers WILL "service" our credit cards, BUT, when they finish "servicing" them, they will have NO available credit remaining! They are best described as dirty.