Keep getting phone calls from this number three times a day at different times??? When you pick up you hear a busy signal. I called it back and it said it was not in service ??? Any ideas who it is

Just got the same thing ?!

They called mea an hour ago. Asked me my name I said no I'm not telling you my name. The man than said do I think he wants to kill me?  Profanity like that went on for a few seconds before I hung up the phone. I couldn't call back

Just received a call from this number.  They asked if I had a security system when I hung up they called back 3 times.  Seemed very sketchy..