Robocall with recorded message offering "special deal" on air duct cleaning. Press 1 to speak to a rep, press 2 to be removed (yeah..sure).
I pressed 1 and spoke to a very helpful rep who told me the company is called California Cleaning and is based in San Jose. She said their website is obairductcleaning.com (this brings up a very generic-looking air-duct cleaning website labelled for Indoor Airquality Solutions, Inc., which in turn requires you to call 1.877-659-5923 for more information).
Whether or not the company is legit, they are violating both the do-not-call law and California's anti-robocall law.