I just gave my phone number out 20 mins ago and got a call . It was a few minutes after I did an on-line survey. I gave my majic number wich I rarely give out. It must be from the survey. Apparently I won an I pad. Guess not.
These people are calling you to see if you have a legitmate phone number. If you answer they put you on a callers list. Your best to not answer at all.