Who called from 2107644282

Yes, that's illegal. But it's harassment, not a DNC violation.

Sadly, the DNC only works with legit companies that must use the list ... most of these "other" folks are using VOIP (think Magic Jack) and can be ANY phone number they want with ANY caller ID (A lot of the boiler-rooms are in India, Philippines and such). I even got a call once using my ID and #...and no, I didn't answer it. LOL   And the only "loopholes" in the DNC are charities, Political calls and any outfit you have done business with or owe money to... What is going to change this? The ONLY way it will change is if the telecoms are FORCED to allow blocking (unlimited) including wireless and being FORCED to deal with #'s with a lot of complaints ...
BTW, when you answer one of those calls, you have told the robo or outfit that you have a live number and is worth being sold around.

I picked up and heard an automated sounding woman say, "Hi, this is [some name] from the warranty department. Can you hear me all right?" I hung up.

Crooks. Block the number

This number just called my landline. I didn't answer. They didn't leave a message.