Several calls a day on my cell phone.  Never leaves a message.  I have not called back.

They are a bill collector

This was a company trying to collect payment on a past due medical bill.

Multiple calls per day starting at 8:01 AM CST.  Annoying.  When I do answer they are not there, or it takes a while for the auto connect system to transfer us to an available operator.  When I answer and say, 'Hello?" and there is no somewhat instant reply or they as me, a man, "Kimberly?" I hang up on them.  Yes they are medical bill collectors.  If you want to collect, I have no problem with that, it's a job.  Call once a day, maybe twice, leave a voicemail, send a text.  Don't call me 9 times in one day.  Be on the other end when I answer.  Even better, get my gender correct, I am not my wife.

I got a call today, early.  I picked up so my wife wouldn't wake up.  The Robo-voice asked to confirm my name, then give my the last 4 of my SS number.  That's when I hung up on them.

I see from a number of responses that they are a medical-debt collection firm, but as far as I know, I don't have ANY medical debts.  Someone's got their wires crossed.