I'm wih you wanting them to go back to their country but you should know that most of those calls originate from another country.
They use a cell phone that gives them the ability to hide or change the number they are calling from.
The best way to stop them from calling is to not answer. When you stop responding they'll call a #that is answered. Good luck.
Just got a call from this number on my corporate cell. I called them up and told them to remove this number. They said they were a cash advance company. Gentleman who answered had a heavy South Asian like or Indian accent. Hopefully, they will remove my number.