They will have to come back and keep trying until they get it right.
Do you have a long level or straight edge of some kind? Preferably a 6ft one.
Place it against the inside and outside of the frame and look for any bows or distortions in the frame.
You could do the same on the uprights but looking at the gap around the door it all looks quite good and straight.
Composite doors generally have to be fitted perfectly level, straight, plum and with no twists. Sometimes an overtightened screw or a screw at a slight angle can distort the frame.
Or he may have fitted it perfectly and the slab is a bit bowed (up-to about 5mm is considered in tolerance) so the door frame may need adjusting a little to match.
Do you have a long level or straight edge of some kind? Preferably a 6ft one.
Place it against the inside and outside of the frame and look for any bows or distortions in the frame.
You could do the same on the uprights but looking at the gap around the door it all looks quite good and straight.
Composite doors generally have to be fitted perfectly level, straight, plum and with no twists. Sometimes an overtightened screw or a screw at a slight angle can distort the frame.
Or he may have fitted it perfectly and the slab is a bit bowed (up-to about 5mm is considered in tolerance) so the door frame may need adjusting a little to match.