called, no message

Got a call from this number. Partial message said "in addition we can clean a dryer vent for free." Get calls from these crooks all of the time. They never use the same number so blocking doesn't stop them. Fortunately not answering an unknown number works just as well.

Called today and left partial message as the one above.  Added them to the block list.

Air duct cleaning scam. Since I'm on the DNC, that means they are breaking the law by even calling me so why would I trust anything they say

Air Duct cleaning service.  Now on my blocked list.