Who are these people?? And what type of SCAM IS THIS??

Received a call stating they were a USS cash international.... Threatened me on the phone at work and also threatened to go to my house.  then cussed me out using the F word and MF word..... Isn't there a way to block your information so they are not able to obtain it.... He knew all of my information, my address and my work.....This is harrassing and happens way to much... any suggestions?

I got a voice mail on my phone saying he was with some law firm that was going to sue me that I needed to contact him asap well I first put his google his number and notice same number but different scam so I call him up and at first play calm told him who I was let him started running his mouth a little bit then I told him I google his number and to me it looks like a scam then he said ok have a good day lmao

These people are calling and harassing me and saying they have a legal court case or criminal case against me.