You cannot get rid of these.  They are calling from spoofed numbers that look like they are local calls to you.  As soon as you block one number they will call from another.  It's a game of whack-a-mole.  Unfortunately they are utilizing VOIP technology to display whatever number for caller ID they want regardless of where the calls originate.  I have begged them to stop calling me to no avail.  This is very disruptive to business because I will dump calls to grab these thinking it is a sales call. 

There is a service called "Jolly Roger" where you can transfer these calls to a robot that sounds like they are talking to a real person.  I have used this and it takes them several minutes to figure out they are speaking to a robot.  It doesn't stop the calls but it did make my day a little brighter.