so.... 8 is enough?  OK, I know that's a lame joke, but what the heck.   Try this:

Look into getting a call blocker or see if your carrier offers call blocking.  If you are answering or the calls are going to voice mail, the calls will continue and maybe increase.  Some scammers share your "good" number with their scammer buddies and you will get more and more new calls.  Treat unknown numbers with healthy suspicion.