Got a call with no message left.

Near daily call, no messages, when answered they immediately hang up, sounds like a mobile connection.

Got a call, no message left. Don't know this number.

I have received a few calls from this number but they do not leave messages, I also called back and got a hang up.  The weird thing is that they called my son and they asked if he knew me, he asked why they were looking for me and told him there was a complaint against me.  He told them he had no idea who I was, and asked how they got his number and they told him that the number provided was in my records.

I keep getting calls from this number on my cell phone.  Have no idea why they keep calling and they don't leave messages