I don't know how you guys do business, but apparently managing the customer's expectations is not part of the way you operate. When I work for a client, he always gets a contract that states what he's going to get (and also what not!) and how much it's going to cost, upfront, not after the fact.
I don't see how this is Socionics related with Ti and Fi interaction. Just an idiot way of doing business for an idiot customer.