One question, WHY do you answer a number you do not recognize ?   When you do a ll you have done is to confirm for them that your number is a viable, reliable number and they WILL CALL YOU AGAIN, AND AGAIN, AND....    Get the point ?   These are scammers who will sell your "good, viable number" to other scammers.   DO NOT ANSWER THESE CALLS !   Let them ring, they will soon tire and take your non-working number off their lists.  By doing this I have cut down the number of calls I receive to sometimes NONE a day.   Question to ponder: what if NO ONE answered their calls ?  Wouldn't they eventually give up and go out of business ?