There are apps you can download that block unwanted calls.  I have not downloaded any (yet!) but have heard many mentioned on other threads here.  Check out the App Store or Google Play or whatever applies for your cell phone and you should be able to find one that doesn't cost too much.

stop calling

Called it back and the guy said his name was Michael with profit web systems... Which after some research found out out its SCAM!!!!!

They have called twice in the past two hours. Maybe sooner or later they'll realize I'm not going to answer.  Please get them to stop!

don't know this caller