Air duct cleaning solicitation + free furnace inspection!  Blocking and reporting if a U.S. business.

i had a call, my phone told me it was suspected reported spam, i did not answer. i retrieved voice mail. it was an automated system, saying dryer vent cleaning and furnace cleaning free inspection. (i have learned in the past if someone calls you soliciting something that is too good to be true it is, and i had a friend who did have something like this happen, the people were "casing" their house. )