Robo-call that will connect you to   "air duct cleaning service',   reportedly a business in silver-springs, Maryland.   I'm on the do not call registry so, I shouldn't get these calls at all.  They hire a robocall service that ignores the do not call registry. The company obviously doesn't care, so how honest could they be at cleaning your air ducts?    Perhaps its just some sucker probably bought a franchise for 'air duct cleaning' tools which said they 'guaranteed' business.  Poor guy.  If that's the case he  Wasted his money.  He'd be better off paying for mailer service and postage to put cards in your mailbox.  Still,  it's a shady deal. If I needed such a service, I'd look it up in the yellow pages or on the internet and get someone close (cheaper).

oh,  I forgot something.    When I said I was on the do not call list,  they said I wasn't, then they hung up.   Not very polite, nor apologetic.  No offer to remove my number from their call list.  Now that I think about it,  I actually think they bought or use some internet dealer, not a robocall service.
I hope the FCC fines them for these calls.

They called, didn't leave message. I registered previous calls from 301-200-**** on my call blocking list. The caller keeps obtaining new numbers from the same 200 exchange.

Got a call from 301-200-1731 at 7 pm EDT Tuesday (4/19).  Robocall went to voicemail but did not wait for my greeting to finish, so recorded only the last few words.

automated call re: cleaning air ducts, no identification of company