These people have been calling me for days.  Apparently they handle newspaper subscriptions, but do a poor job obviously.  They call me at 6am Pacific time everyday, and nobody is there.

I got a call from 210-587-2213 today, same thing, a hangup when you answer the phone.
tried calling it back, puts you into a automated answering system and if you hit 0, you can't leave a message because the mailbox is full.
I called back again and hit *8, which apparently is their in house mailbox, then hit 18 as an extension.
I got to talk to a real person and requested removal of my phone number from their database.
I have gotten a call from this same company a few weeks ago using a different incoming number, and also requested removal of my number from their database.
At least you can call them back, and reach a real person for all of the good it will probably do.
Maybe everyone out there should try calling them back, maybe you can annoy them as much as they annoy you, GOOD LUCK!!

THANK YOU THANK YOU THANK YOU.... Your information below helped. I've been getting multiple calls 4-5 times a day on my work cell phone. I was able to speak to someone and have my Number removed :)

Thanks for your help.  I work for a global company and have been receiving these calls on my blackberry three times a day.  it is disruptive and I don't understand why they don't just answer.  I was able to leave a message for them at the information that you provided.  Extension 18 is apparantly the extension of a Maria Demer. I hope this works.  I was requested by our help desk to follow up just to make sure they received the message so  I will call back tomorrow.

NO MORE CALLS PLEASE