Air duct cleaning telemarketing pest - using a false 'spoofed' number.
Evening call - after a long robo-dialer delay, a cheerful guy named E.J. (or T.J.) came on.
When I asked who was calling he said 'American Airflow', and launched into a scripted pitch for air vent cleaning.
I asked him to remove my number from his call list 'as required by law'.
He apologized and hung up.
American Airflow is a real heating and cooling company, but I do not know if he was really calling for them, or just using a familiar name.  Probably just a contract 'appointment setter' using a fake phone number, fake company name, fake low-cost offer.