That's because most of these people spoof their numbers and just use random numbers. Sometimes they'll even use legit business numbers. I had a number call me one time and when I called the number back, it was a business owner explaining to me that he has been getting calls all day and hasn't called one person.
I answered this call to try and get on the "do not call" listing. It was a recorded message regarding a car warranty stating they had mailed me a final notice and were just wanting to call before closing my file. What is the most annoying part of this is that I never owned the car they call about and I have a brand new car so my warranty is definitely NOT expired.
I agree Rodger. This site would be so much more beneficial if people would only post pertinent information about the caller. Pages of "I didn't answer" or "left no message" is redundant and useless.
If ANYONE deals with these scum bags who make random calls about warranties, a survey, your computer not working, etc. you get what you deserve. As long as there are people stupid enough to respond to them, they will keep trying to call.
By the way, I just got my 3rd unknown scam caller on my cell phone within the last 30 minutes. There should be a special level of hell for these horrible individuals who have nothing better to do with their time.