Are you crazy? First of all, simply don't answer the call if you don't know who's calling. Second, don't ever call them back. Either way, you are confirming you have a viable number and you will find yourself on many new lists. If they're legit, they will leave you a message.
Wanted "Mark" when I told her it was the wrong number, she started to say "maybe you can help me." I hung up because I got a call like this before and they wanted money for something.