This number calls both my home and my cell, but does not leave a message at either place.  They call 2-3 times daily, but when the number is called back, it's busy.

Caller left voicemail with call back information.  Believe it to be tied to a payday loan.  Says they are investigating allegations filed against me.  They have used skip-trace to call every number they can find.  They are not licensed to do business in my State.  Make them provide written documentation about the balance and that they are authorized to be collecting that balance on behalf of the company they represent.  I would even go as far to say to call the company and verify the information.  I could not find a company website, or BBB information on the company, or their exact location.  This number seems to go to a location in Colorado.

Caller he was from a Nationwide Check Clearing Office and said  a man who lived in TN had given my name as a checking reference.  I thought it was a little suspicious.  I probably gave him more info than I should but managed to ask a couple of simple questions which he hesitantly answered all but one.  I told him I didn't know any such person and he said thank you and hung up.  Later when I thought about it, I became very suspcious and tried to call back but to no avail.

The first time I answered and they pretended to be a check verifying co.  I tried calling back but of course no answer.  Now they call at all hours even in the middle of the night.  I don't answer and they don't leave a message.  They just keep calling

I answered the call, less than two seconds, the caller hung up.