A call claiming to be mastercard. Says that your account has been lost and to dial a extension for their security department. Scam.

Just got a call from 514-447-3471. The recording said my Mastercard account was locked, and asked me to talk to someone in their security department. After pressing 1, it asked me to enter my Mastercard number...

DON'T DO IT. IT'S A TRAP!

I received a call today from this number telling me my mastercard was locked and to press 1 to restore it.
Sounded like a scam so I hung up.  Some people suck.

Computer voice said that my Mastercard is locked, and suggested that I press 1 to reach the security department. Since I don't have a Mastercard, I pressed 1 out of curiosity, and the same computer voice asked for my full 16-digit account number. Clearly a scam, but I don't know what law enforcement to inform.

Report to the Internet Crime Complaint Center http://www.ic3.gov/complaint/default.aspx , the Federal Communications Commission http://esupport.fcc.gov/complaints.htm , the Federal Trade Commission https://www.ftccomplaintassistant.gov/ and your state AG, as appropriate.