I think in 8 years I have only had one phone me back up again. I always say to just give us a ring next year when you are ready. Then make a decision if they do phone back as to whether you want them or not. If you are bursting at the seams with customers then the decision is easier.
I just feel its an excuse for another problem - they don't like you, they don't like the system, they don't like the price, they can't afford it any longer, grandson wants to do it for all that money, they are scared of what their gas and electric bill is going to be if its a bad winter (no different for us), etc.
In fact I saw a trad cleaner cleaning one of them a couple of months later. Customer's lie - fact.
We work in a very close knit community. Although we know some of the families we don't know them all. Upset one and the word soon spreads. No good comes from being rude to anyone, no matter how they mess you around.
Window cleaning is a 2 way street. We benefit from their employment but they benefit from our services. They are entitled to do what they like, but we are equally entitled not to provide our services. Its actually not very complicated.