yes, I have no doubt he was out of order, and you were within your rights to take advantage, but from what I have read the only thing he did wrong was put the price up after a clean, and fully deserves to lose it.
he used the cheap first clean method to gain customers just like you are, no

ok he did it the old fashioned way by knocking the door and then chancing his luck on the second or third clean
how is that different to groupon, admittedly he sounds a bit dodgy, and I am sure you will benefit from this