What Fly Unity said. Also, the Chief CFI of a 141 school is always in a balancing act between viewing you as a consumer, and a product, whereas you only see the consumer side. What we're always afraid of in the 141 world is getting a call from a DE or an employer that goes like so: "I've got A10hog here in my office, and he says he learned xyz down at your flight school. Now, what are you morons teaching down there?" So, a big part of the percieved inflexibility on the part of good 141 schools is really quality control. In a way, it's a good thing that he didn't wave you out of his office, and say "yeah, sure, go right ahead."
I know it sucks, but it's part of getting a good education.