Sorry to hear about the damage caused during your installation Chris. Occasionally damage to plaster and decoration does occur due to the force needed to remove the old door/window. Our fitters are instructed to 'make good' on these situations to complete the install, but as they're not professional plasterers they're not always too confident with this which may be why it's been avoided. I'll pass the comments on to our customer services team to investigate with the installation depot and get this rectified.
Apologies for the inconvenience.
Regards
Jonny
Digital Team