Hi,
apparently someone couldn’t quite read the plan.... I would now simply insist on execution according to the work plan. This may possibly mean: redo the roof structure once!
No idea what that costs, it will probably easily be a five-figure amount.
Of course, the construction company won’t want to do that. Then the question is, do you want to live with this appearance forever? If yes, for what amount?
But it is also important: have you already made a written complaint? Don’t let some deadline expire afterwards and it be considered accepted!
Best regards,
Andreas