Christ, this is why since we bought our house I've barley paid a tradesman to do anything and done practically everything myself. They let you down at every, single, possible, stage.
Whether that's not turning up to quote, not turning up to start the work, being impossible to contact, starting but not finishing the work, moving the goalposts for what they said they'd do, taking too long to finish, shoddy workman ship, shoddy finish, making a mess, breaking something else, trying to add on hidden charges or failing to provide certificates on completion.
It's taking me 6 months to complete any room, taking up my evenings and weekends and still costing me a fortune, but would do it every time again.
Anyway... Back on topic... Even if the door was "too large" for the opening and you had to take off more than the trim allowance (top and bottom) this is super easy to fix. By cutting off the wooden block (that's been cut off anyway cause the door was too tall!) removing the door facing with a chisel from the block and then gluing the wood block back inside, you get a perfect finish.
How do I know this? Because after 3 years of DIYing my entire house renovation I'm a better than some joiners with a lifetime of experience. Some folk are a waste of space.