Company dedicated to harassing, annoying and threa...

Company dedicated to harassing, annoying and threatening people at random. Even if you do not owe anything, you receive calls where an answering machine threatens you with legal proceedings. Obviously, they do not tell you what they are claiming ... because: 1 they call at random and 2 know that you can report them for harassment, defamation, etc ...
In my case I have returned the call to them to delete my number and in principle they have done so. I hope I do not have to go to Madrid to explain it in a different way to these bastards.