I have been getting multiple calls from this number in the afternoon and evening for the past day or two.  I do not answer and no message is left.  To whom does this number belong?

getting calls, too, starting in the same time frame ... undoubtedly a debt harrassment company that just bought some new files / phone numbers, where or not there is any legitimate or still legally collectible debt in them.  generally they try to get money by intimidation, not thru the courts.

It says on my Caller ID that it is with AAA Detention, whomever they are.  I was at home 2 days ago when they called my home, and I didn't know who they were so I let the answering machine pick up.  Then I heard them hang up without hearing the rest of my outgoing message.

I tried to call this number back, but it drops the call when you call them back.