Found the number on my caller id.

Robo call selling air duct cleaning.  If you hit 1 a person answers.  My caller identified herself as Marina from the AC company.

robocall about air duct cleaning

Called my landline on Aug.2nd 2016 at 10:54 AM and CID displayed "Waldord MD 240-607-5078" and as usual, no VM was left. Since no VM was left, the call wasn't important to begin with. I won't answer my landline from numbers that I dont reconize, regardless who is calling. I won't call the number back to find out who they are or what they want either. I looked this number up and it shows that is coming from "Aspen Hill, Besthesda, Frederick" area of Maryland and not from Waldorf MD as indicated on my CID!
Another number that was spoofed in their attempt to get you to answer your phone! Morons!
Caller: Waldorf MD 240-607-5078
Call type: Nuisance call

same   old bunch of beaners.  They used to have a person calling, with a spiel like "...you are an old customer - we have been there before"  etc. etc. A complete lie. Now, they have discovered robo-calling with a computer-generated message about "improving your a/c"  Geezus - if your "ducts" are clogged up to the point that  the efficiency of your a/c is effected, you've got a real problem, and you need more than "duct cleaning".  Of all the people that I know (and that's a lot) this has never been an issue.  "Duct cleaning" used to be a franchise that "cleaned" the wallets of a few suckers.  It's fairly easy to set up "duct cleaning", with a vacuum that (seems like) could pull your drawers off.  However, the "franchise-ees" soon discovered that there wasn't much demand, or need, for "duct cleaning"  and realized that they were stuck with a truck-mounted super powerful vacuum, and about a hundred feet of huge diameter hoses.  Unfortunately, all of that crap couldn't be "re-purposed", and the only thing it was good for was as a paper weight.   How do I know all this?  I'm a retired "problem solver" with Federal law enforcement, and in the process of my employment I met up with one of their former "franchisees"  (read sucker).    Sooner or later, these aliens will realize that there isn't hardly any "market", or need, for "duct cleaning", and just fade away - or come up with some other scam.