we answer say hello three times and still no reply

I received a phone call from the number at the top asking me to confirm some information about my address and I called them back but my network told me that is wrong number.

CALLER CALLS ONCE OR TWICE A WEEK. I DON'T KNOW WHO THEY ARE OR WHY THEY ARE CALLING. WHEN I TRY TO CALL BACK, IT IS ALWAYS BUSY!

They have been calling for about 4 days now, 7 to 10 times at day. I am going crazy, can anyone do anything about this, if anyone out there know how to get rid of them please tell me.

Scam! I got a call from a man with an Indian accent. He asked if I had requested to have marketing calls blocked. He said I would be receiving a call which contained a code and he would need that code when he called back. I could not tell if he was calling from Qwest or from Craig List. The number was blocked. After he hung up I blocked all anonymous calls using *87. I then received a call from the above number. It was a recording that said it was Craig List and they left a 4 digit code. Immediately after that I received more anonymous calls which got through despite my call blocking. I did not answer the first two calls. On the third I did answer and he requested the code. I told him I was not interested and hung up. When I try calling the number it's busy. Bottom line is if you get a call from this number hang up and if they call back tell them you are reporting them.