harassing and threatening calls

this number keeps calling when i call it back, it says its a non working number...how is this possible?? the caller did call back again..and when i told him not to call this number again or he would be sued..he laughed called me names.. and said he'd kill me if i ever showed up to him... something should be done about this

This number keep calling me and hanging up.

caller keeps calling then hanging up. Has called 5 times in the last 24 hours.

Had my credit card number and knew my name but for some reason I did not feel right after accepting promotion. I call back the number but only an automated machine picked up instantly hanging up on me. I dont know who this is, but I need to talk to someone because this is very unsettling.