I've received the same phone calls about free gift cards and reviewing products for $1.99 shipping. I said no but they continue to call and before I can say anything, they hang up. When I've called back the call is disconnected immediately.
They called and said they were going to send me a package of free stuff (gift cards included) as incentive to buy their product (they did not mention what their product was). The lady was a bit impatient when I began to ask questions... when they asked for my address again I hung up. Pretty sure this call was from the same people who called me last week from the number 323-892-0287. That call was about a free $300 gift card and that time they actually hung up on me when I began to ask questions.
Be careful calling numbers like this back and pressing any buttons. If you have done this, check your phone bill carefully to make sure that you are not charged $9.98. It has happened to several people .