Had a Virgin broadband pest at my door twice in one week. Seems to have been trained to ignore ‘Sorry, I don’t do any business on the doorstep.’
All good/effective door to door sales (broadband, double glazing or eternal salvation) persons have to be the same. Very thick skinned and keep talking until the householder relents or shuts the door in your face. If you are especially keen (desperate for commission), keep talking to the door in case the householder opens it again to see whether you are still on the doorstep. Try and find that chink in the householders response that you can get into and twist until you make a sale. Customer says they can't afford it, pretend to offer a better, personalised deal / cheap credit. Customer not sure about the quality, here are some references from nearby residents. Customer needs to ask their partner, great excuse to keep coming back until the partner answers the door, then say the first partner said they wanted you to call back.
I deliberately and intentionally knocked on your door at mealtime because that is when there is likely to be someone home. So sorry to bother you! No, you aren't, because if you were genuinely sorry you wouldn't have knocked in the first place.
I refused Lila the necessary permission to dig up my shared private access road. You can't stand in the way of progress he said, guess again, yes I can! Statutory Undertakers would be a different matter.