Who called from 8479137000

Has called a number of times to my direct line at work but left no message.

I looked this number up in white pages and found additional information - Ameritech Illinois - Half Day, IL or Lincolnshire, IL.

Phone Type:  Half Day WLNGILWGDSO - Land line

Has called my cell - didn't answer, left no msg.

Collections from a line that normally doesnt make collection calls. Someone actually dials the number rather than an automated call machines. still Credit Card Collections related.

Just got a call on my cell phone from this number for the first time.  Did not answer - no message left.