DNC for a business line? If it's listed as a business number, DNC doesn't cover it.
https://smallbusiness.chron.com/not-...ses-69230.html

"The National Do Not Call Registry applies only to consumers; business phone and fax numbers are not covered by the registry."

https://www.ftc.net/on-the-do-not-ca...at-to-do-next/
"Only personal phone numbers can be listed on the registry, so the call limitations don’t apply to calling business lines or to making business-to-business calls."

Could be that he's doing fraud by putting his name on it? That's a bit farfetched, but he definitely doesn't have a leg to stand on.

The problem is the TCPA. "It is illegal to make marketing calls to any wireless line using an ATDS or Pre-Recorded message without first obtaining the express written consent of the recipient or business."
--> If you dialed from an autodialer to a cellphone, it's illegal. If you had human intervention, it's not. These are bottom-feeders who make a living doing nothing other than posting their cellphones everyone, and praying that someone will call it. And he automatically assumed that you dialed from one, did you notice that?