I get the same calls and need them to stop. Tried calling, no answer or busy. Going to put my number on the do not call registry!

I would like for these calls to stop. Can't call back get busy   signal   or the number is not in service .

calls and there's no voice. when calling the number there is a busy signal.

I keep getting calls from this number, but when I answer there is nobody there. If I wait a few minutes, the line will go dead. When I call back, I get a busy signal. How do I make these calls stop?