This company called 4 times in an hour.
They never leave the message, and never say anything,
I just hear the beep sound when I pick up the phone.

This company is Lexis Nexis who verifies information of candidates that a company wants to hire for work.  They left me a message inquiring about a release form that the company hiring me is requesting.

They started calling at 3 a.m. and did not stop it went on about every 5 minutes, I finally had to turn off the phone.  I would answer the phone and nobody would say anything on the other end.

Calls the office and asks for associates who have listed us as an employer.  This last call, I told caller the associate does not work in our office, and we do not take messages.  I asked if it was of a personal nature, and the woman said "Ma'am, it is of a private business matter.  I want the number of your payroll department".  Of course I will not give this information out.  She would not give me her name.

Called for employment verification.  

It was for a previous employee with a previous company.  I could not verify the actual dates, but could verify his position.  They asked if I could direct them to who could verify the dates.  I told them just to call the company & ask for HR.  They asked if I had the number.  I told them I didn't, but they could always google the website.

They then asked for my position & name (which the name part was weird since they had left me a voicemail that included my name).