The caller ID showed the # - 414-431-4451 and the 'name' that appeared was OAC.  Have no idea who/what this is.  No message was left.

same as above.  When questioned what it was in regards to man said "a personal matter".  When I replied, "if I can't get more information the call probbly will not be returned" he replied with, "he will know what it is in regards to just by my name."

I called the number back to see how they would respond and it came up as a collection agency of somekind.

OAC on called ID.

same things as stated above. Company called OAC from Milwaukee. Only they were calling on my cell phone asking for my daughter, a minor, and would not give me information about why or what the call was about. So she called them back and they wouldn't assist her either. All very secretive and automated....typical of what our world is becoming.

Collection agency:

http://www.oac.bz/aboutUs.asp

I've been receiving this call for awhile. It claims to be for a medical bill I paid off two years ago (for $39). When I asked them to send a statement of the debt they said they could only legally send out two statements and that they had already sent me two (which was a lie). The never asked for verification of my identity, and one day my husband called the number after I had ignored the call and they proceeded to tell him all about their claim without verifying he was actually my husband, and told him that this was negatively impacting my credit (also a lie, since I had just pulled my annual credit report a few weeks earlier and this bill wasn't on it). They also asked for a canceled check, and the woman started yelling at my husband when he said he wouldn't pay without written proof of the debt.