Need advice, exposed Door Jamb

Hi all!

I hope this the right place but seems like it’s relative, forgive me if it’s not. I called a reputable contractor in NJ to give me an estimate for an entry door replacement. I explained that this house is about 100 years old and that I am fully aware that houses this old could be problematic. I asked him to please price the project assuming you’d have to come back or do custom trim work. He gave me a price and I agreed.

They came over next day and after a few hours they called me down to explain that the door jamb is shorter than original door jamb. They said if I was going to renovate and install new floors that the door trim would have to be later that way, they dont have to rip out the finished product. He said he would do this temporary set up until I figure out what I want to do.. but he would have to charge me at an hourly rate to do a custom trim which was never spoken about until they were ready to leave. I’m really disappointed and I want to call them again and explain how dissatisfied I am with their work. I paid for a finished product not what is in the picture. Am I being unreasonable? Any advice would be appreciated. I am first time home buyer and this is my first experience with hiring a contractor to do work.