I've had those calls too. I almost feel for it the first time as well. It's rather distressing that first time. But, it's just infuriating every time after that.

And, you can't even be shed of them by blocking the number. Because, it's not their real number. They're cloning phone numbers and the line registers a different unblocked number the next time… and the next… and the next… ad nauseam.