Beware of Telephone-Based Phishing
Another example of this type of vishing scam occurred a few years ago when someone broke into an investment company's system and used the information to try to get some money. A customer called a consultant with the investment company directly to invest money in a fund. Within the hour, he was called back by someone pretending to be a broker for that fund. The original investment consultant had not instructed anyone to call the customer and did not know how the caller received the information.
Please use caution in providing information to someone over the phone if you have not confirmed their identity. More information about vishing is available here, and tips to avoid becoming a victim of vishing scams are available here.