You've been selected as one of 4 lucky people in the area to get a free burglar alarm system.
DH answered the call yesterday and told them, thanks but we're wired up already.
I wouldn't have thought to say that, I'd just said not interested thanks out of habit. But I wouldn't have thought about the fact that the caller was a crim trying to suss out who in the area is, or isn't wired up!
There was no return number (no surprise there) but surely someone must be able to deal with this kind of thing??