Have gotten a call from this number and two other numbers in the 480 area code.  No one leaes a message.  Who are these people?

Every day I recieve twoi or three call from this number with no messages. When I call back the number just ring constantly no voicemail. I used another phone and the message I get  sts  they do not accept blocked call. I need this stopped or I am about to call the Phonex police and  report the harrasment.

SO FAR I HAVE GOTTEN 5 CALLS WITHOUT ANY ANSWERS OR MESSAGES AND WHEN I CALL BACK NO ANSWER. I EVEN CALL AFTER  WORK SINCE I AM ON MY  JOB NO ANSWER IT JUST RING.
PLEASE HELP  ME TO STOP THIS.

They called at 2:05 PM and hung up as soon as I said "hello?" A quick search says the number is registered to Qwest Corporation.

i got a phone call from this number on  my day off and some man answered saying that he is calling in regards to my credit card account and when i told him i did not have a credit card he got very rude and made the comment saying "what year is this? ... 1985? nooo its 2009 and everyone has a credit card." i told him i didnt have one and he asked why. i told him i dont have excellent credit to get one. then i aksed to spek to his manager and he made the comment " oh yes let me transfer you to someone who cares!" then he waited a minute then said oh wait nobody cares because you dont have credit. then hung up on me. very weird. he could not give me a business name or anything.