I received a call from 231.224.2024 at 11:01AM on 2/4/11. But I was not able to answer it. I called the number back and it was an automated system stating "we are calling about a publication you have received or are eligible to receive and we apologize if you received this call in error, please leave your name and number to have your number removed and it will be removed within 24 business hours". The mailbox was full and so I was unable to leave a VM to have my number removed.
At 10:16AM on the same day, 2/4/10, 45 minutes prior to the call above I received a call from 612.808.5524. Again, I was not able to pick up the call but when I called back it was the exact same automated system and words noted above - the mailbox was full.
These 2 numbers are probably tied together.