Just got a call from this number, saying they are from visa and MasterCard.  When I asked who this is, they simply said rudely "Jason," and gave trouble when I tried to get the company name.  Call back to the number shows it's out of service

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 you will regret it forever!