I'm going to guess that this is a new scam. Best thing to do is NOT answer calls from numbers you don't recognize. If it's important, the person calling will leave a message.
Add me to the list of people getting this number calling repeatedly. If the phone companies would stop selling people's name and phone numbers, these kinds of scam calls would drastically be reduced. As someone else said though, the most important thing is to NOT pick up the phone!