This is a very aggressive person/people (I spoke to many) who all have a middle eastern accent. When pressed they will only tell you that they are with an attorney's office and that you will go to court if you do not give them personal identification such as SS #. I hung up. Scary thing is they left a demanding message on both business and cell phone.
If it is an attorney's office and there is something happening they would have to notify you via certified mail. I wouldn't trust them.