Has called once a day for the last few days.. Dead air

I got two calls from this no. in the second time, i picked the call, but noone answered he phone, so i disconnected that call, please help me find this caller area and information.

always calls cell phone, but does not leave message

Has been calling several times a day

I have received the same messages as everyone else. They call me everyday a number of times a day. Today was Amber Knight and Holly, Mr. Jones, Joe Craford, Kristine in the past. Not one of them stated my name, the company they are with or what they specifically what other than there is a file / matter they have been assigned. I do not take calls if I do not know who they are from.

They call ring three times, I answer they hang up.

the caller said called from law firm.

didn't have a chance to answer