when they know its your door in first place then proceed to do it just to get job and you know they will only last six months as you have seen it a hundred times before ,then poor custie comes back cap in hand apart from i told you so ,sorry mate your space was filled that day you cancelled and i aint got more room on my round now , but its by how much folk will do a job for ,and when you have an area desprate for cleaners and they were only charging a few quid and you folow by say a tenner they think your a rip off mearchant ,lol oh the joys ,its a funny old game