They just call and hang up as soon as you answer!  When I called back it just rings and rings and then goes silent.  Tried it twice and got the same result.  

These people have called me three times today. I try and call back and no one answers

They have called our office twice now....619-545-5454.   When you call back it's a busy signal.  

this number keeps calling my phone.  It costs me at least $1 everytime that they do because my phone is answered by an operator.

Its a company that uses the local number to pitch to local people, its called spoofing and they are not allowed to do it.
http://www.fcc.gov/blog/caller-id-spoofing-whos-really-line
I have talked to these people and the company is a sport advertisement company that lied to my by saying they work for the local schools (i.e Coronado High school) to raise money for sports. I work for the high school and they don't. Its just a marketing company that lie to get you sales. They have called me 6 times today and this has been going on for months. I have told them (the few times they answer their own callout) not to call me again.. but an hour later I get another call. Im to the point of filing a small claims court against them. The great thing about that is, im sure they wont show up. That means I win!
Report them: http://www.fcc.gov/complaints

Rude *itch from this telemarketing firm called our office again about "sending packet for upcoming move" then hangs up again.

called and hug up

Got this call today.  No one on the line but it didn't disconnect for several seconds after I answered.  No background noise, either.  Thanks for the info about the purpose of these calls.  I will note this as a number not to answer.

Rude telemarketing caller.  Calls asking about your company's "upcoming office move" even if none exist or no plans to do so.  When I informed the caller of this she hangs up without saying a word.

Very rude caller. Asked about company locations then hung up mid call.

This # calls regularly, but hangs up before I can answer it.

I got this number on my cell phone and when I answered, no one would say anything.  Second call I did not answer and a voice message was left, but it was not someone speaking, just a short noise, enough to capture the voice message feature.

Just got a call from these people for the third day in a row.

They keep wanting to know if the company I work for is moving, or opening up new locations.

As I've told them over the past three days, NO (or don't know).

Call our office main line and hung up, this is day 2. And when you call the number back it just rings.

called our office line - just hung up