PLEASE LEAVE ME ALONE
Every couple of months, a knock on the door and some guy from a local double glazing company tries to sell me double glazing - now, my house is a relatively new build (and as a result has double glazing) - this fact never deters them, and when this little observation is made, then tries to sell me a replacement front door, and a conservatory.
Their persistance in the face of obvious failure (given that every house on the estate already has double glazing) is admirable, but in the event I ever need the services of such a company, I will be taking into account the nuisence factor of having had countless evenings disrupted by their sales staff… and they won’t even be called.