I bought a round recently, contacted and cleaned one of the jobs, only to be told later by the custy that the guy I bought it off was never there cleaner.They paid me for the one clean and I walked away. The neighbour confirmed her story. I just left it as it was clearly a missunderstanding and not worth chasing.
I once had a situation where some guy was canvassing and was telling my customers that I had given up and passed my work on to him. :Fortunately my customers know me well enough to know that I would have told them first. haven't ever seen the guy or lost any customers to another w/c, so it would seem that his scheme didn't work. John.