Who called from 2019420334

Same thing here.  Nine calls yesterday, 5 so far today.  Can't call back as described by others.

If your phone number is on the national do-not-call registry, you could try registering a complaint there.

https://www.donotcall.gov/

Calls all times of the day and hangs up!

This number calls my phone all the time and it's kind of annoying. I can get them one day and not get them them for a week or so and then it starts up again 6 or 7 call, some of them being back to back. When I called the number back it just ring.

Calls 10 to 15 times a day and hangs up. I call back and it goes to an answering machine and/or is busy or disconnects.

Area code 972, got 3 calls a day from 201-942-0334.
I will not call back. I know better.
You can place on your cell "REJECT LIST".