Keep getting this call, but they don't leave a voice message. I'm thinking this some kind of markeing junk I don't need calling my phone.

I keep getting repeated calls from this # daily and when I call it back I get a recorded message "The # you have dialed is not in service". How do I stop these calls.

I was getting multiple calls from this number.  I blocked it and then I started getting the same alls from a Montana number.  I have tried to call them both back and I get an error message that says your phone call cannot be completed as dialed and you know the rest.  I have blocked this number as well.  

repeated calls  will not stop.....when you call the number back it is not in service.

I am getting this phone four times a day. when I call back, it is out of service. One time I took the phone and yelling out loud.
they hang out the phone. somehow they found my name and phone number .,

11 calls in one day.

This number called me every hour. And if I picked up, no one was there! So annoying. But if you have an iPhone, you can block them! Settings -> Phone -> Calls-> Blocked - > Add New (just add them to your phone so you can chose the contact).
    
Then they can never harass you again.

Keep receiving calls from this number 970-236-9052 but no message is left

Answer as:   Good afternoon, Federal Cyber crimes, may I help you.  Instant hang up!!

Keeps calling multiple times a day. At every hour. Won't stop. I'm on do not call list. Called the number back and is out of service. Spam Spoof call. Illegal harassment. These people will be sued.

970-236-9052 keeps calling. Something about Muslim brotherhood and guns? Called back to complain and number not in service. Spoof. Scam. Illegal.

Keep receiving calls from this number. No message is left. Tried calling back and always just get a busy signal.