That claims they will start legal proceedings against me. I just let it go to voicemail but will file a complaint with the state and federal do not call lists.

The voice mail was pretty threatening and told me to call an 800 number to see who I owed, and how much. One would think the collection agency would have that info, right at hand.

my phone number, which I have had since 2012. After the second time they called I did return their call and explained the situation and requested that they take me off their call list. Apparently they did, but about six months later I got the same call from a different collection agency, or whatever term they use. They claimed to not know about my previous contact with the other company. I think what is happening is there are phone lists that are resold after a company fails to get you to comply with whatever it is they want. At that point a second company attempts to do the same thing. It has now been about a year, so maybe I am, now officially off the list.
By the way, for the past several years I just ignore the message. Nothing ever happens and my credit has not been affected.
The name they always reference is Bill -------. Jr., who I have never heard of.

Now, I've stopped answering any calls if I don't recognize the number. If it's a legitimate call, they will leave a message.

I also signed up with a robo call screening service that my cable service provides, for free. It's made a huge difference.

Sometimes I add a few nasty comments if I am in a bad mood, which I seem to be all of the time these days.

Is it "Microsoft Service" calling on that one?
I get so many I do lose track.
I did just buy a set of 5 phones with call blocking, on QVC or HSN - can't remember which- which I used quite liberally when I first got it.
The phones are said to be made by AT&T. - there again I suppose some entity, likely Asian, bought those naming rights.
But the phones do work well enough