We've been stuck in admin nightmare for so long. I'm embarressed to answer questions about the build when my friends ask because I have to keep telling them that the builder has made another mistake in the paperwork and it's taking another 2-3 weeks to get it corrected. For example, you would think that when the draftsperson draws the construction plans and adds the laundry cabinetry they would be able to work out which of the sliding doors should be the side that opens, especially when they drew a step outside... but no, it's up to the client to find their mistakes again. SO FRUSTRATING!
BTW, on the slab plan... is it supposed to have markings for all the drains? Mine only has the kitchen sink indicated, nothing else.
Lately it's been happening with everyone. I feel like I am really lucky for a good run. If I were you I would be speaking to someone higher up and ask them to pay for the time waste.
On my slab plan i don't have any marking for drains either.