It's a call from American Air Duct Cleaning.  After a couple of days of continual calls, with no message left on the answering machine, I decided to find out who was calling.  It's just a sales pitch for air duct cleaning with a "terrific offer in your area".  Nice gentleman on the phone, but I declined their "terrific offer"... then blocked the number.

Thank you for a detailed post of your call. I really appreciate it. I always come to these sites and sometimes people do not fill out the messages completely. Thank you again.

Its Advanced Air Duct and Carpet Care. I took advantage of their specials they had. They came out and did a GREAT job! They even cleaned my carpet for FREE!. I am so happy that I did this. very affordable! I will keep going back to them!

Those of you that let the calls roll to your answering machine, voicemail or worse yet answered the call you have just ensured you will more of these calls.  Maybe not from the same number, but they’ve just identified your number as valid.  Most of the initial calls originate from software (aka; ‘robocalls’) – once your number is identified as active, then a person may be there on the follow up calls.  If you have the capability to ‘block’ the number that called – that is the best action.  If you don’t have a blocking option, keep a phone with caller ID close by and simply hit ‘talk’ and ‘off’ simultaneously.  This will reduce the number of nuisance calls, but not stop them.  If you really want to block them – there is software available that a layman can install.
PS:  I think Call Notes should add a 'Call Type' for 'Spoof' or 'Scammer Calls'!

I agree with your suggestion.