Identified himself as a company that had done previous work on the furnace at my home. Called me a ****** idiot, pretty sure this guy doesnt work for a furnace company.
Furnace and dryer duct cleaning. Said they did my house 5 years ago (pretty sure they didn't). Tried to be polite for the first 30 seconds as it was a local number. Caller got increasingly rude and belligerent. Finally just hung up.