Who called from 5081000000

Been calling daily, leaves no message. Comcast wont allow me to add this number to the call screening for some reason ?

Calls my house at least 5 times every day  
It is a phony number no such number in Massachusetts
So who ever you are STOP
Cause if I every find you your dead meat

Someone needs to do something about these types of intrusive callers. They seem to have the advantage since they know a heck of a lot more about us than we do of them. Sounds like there's a lot more people who feel like I do. How can so many various companies come up when researching the same #? Every time I think I'm covered by a Do Not Call list of sorts, more calls manage to get through???? Any helpful suggestions?

I get Calls from this number several times week.  I do not answer.

coming from st, pierre and miquelon, bc, calling and being called from my home number,