Screed in the bathroom applied incorrectly - What to do?

Chiseling out and manually applying new screed with a slope in the shower hardly takes any time. At least not so much that the schedule cannot be maintained. Is underfloor heating included there?

Underfloor heating is not present

Then I also don't understand where the problem is...

Screed out and done. Alternatively, coal back (that was a rip-off anyway) and build the platform for free. I absolutely can't understand option 3 – what do they want to do with the ceiling on the ground floor?! I'm totally clueless right now.

...
I absolutely don’t understand option 3 – what do they want to do with the ceiling on the ground floor?! I’m totally lost.

Deterrent?
Breaking up the ceiling would include the screed... but the ceiling would be unnecessary...
I don’t understand the point either.

Maybe use this point as an argument.
Take position 3, have it explained again, and then take point 3 without ceiling demolition [emoji12]
Or did they totally forget the drain???

Deterrent? Raising the ceiling would include the screed... But the ceiling would be unnecessary... I don't understand the point either.

Maybe use this point as an argument. Take position 3, have it explained again, and then take point 3 without ceiling demolition [emoji12] Or did they completely forget the drain???

Correct! They have to install the drainpipe, which was forgotten. That's why it's installed above the ceiling and shielded with spotlights as a cover for the pipe!

Then they just have to chisel up all the screed, right up to the drain, which must be somewhere in the bathroom. No problem either... then what would be a 2-hour job turns into a full day’s work.