Answered and did not say anything, and as usual, in ten seconds the dial tone returns indicating a ROBO caller. They are so obvious. If you answer and don't say anything, or make any noise, in ten seconds they are programmed to hang up and move on to the next number to dial. Try it, it works most of the time.
Used robotic dialer. c.i.d said GRILEY,GLENN. Probably spoofed.
Selling home improvements. Probably not a contractor. likely a boiler room operation that sells leads to contractors.
Never do business with anyone who telemarkets you.