From a client point of view - I would want the cheapest prices
From a photographers/business point of view - I would be mad, but i would think of a way to win the customer back.
General overall point of view - The photography market is just like any other business, cut throat! People want the best prices, especially now with the economy. There is no legal action you can take. It is just like looking at ads in a newspaper, prices on things. You have to not only think about your business but also your clients and competition.
Looks like you learned the hard way as well, I had to also
