The DoNotCall Registry works on voluntary compliance like speed limit signs on highways. Honest telemarketers honor the Registry, abusive telemarketers and scammers do not. Placing your address on a DoNotRob list does not guarantee your home will not be robbed -- don't you understand this?
I called the number back and it was wind river environmental. They asked how long since septic system cleaned. Said I was on town sewer so it has been awhile. They said they must have dialed the wrong number.