Water connection installed incorrectly - Right to correction from the general contractor?

Have you, as the client, signed the execution planning, was the drain dimensioned from the position like that in the drawing? If yes, there isn't even a hundred. I also don't know what your problem is, because it's just a damn siphon. Proportionality zero.

With illegal work, you have to be really annoyed

I personally have nothing against cash payment, but that comes with the lack of warranty and subsequent repair. Quite simple.

Well, this is about the pipes lawfully installed by the GU/SUB, not about the undeclared work, which relates to the hardware on the outside, i.e., the ceramics. But without informative photos, I don’t want to write any more here.

Well, this is about the pipes legally installed by the GU/SUB, not about the undeclared work, which relates to the hardware on the outside, i.e. the ceramics. But I don't want to write more here without informative photos.

Yes, that's clear, but do you see the dilemma? The same SUB installs pipes on invoice and the hardware he gets from the TE undeclared. How are you supposed to get to the bottom of this now?

Doesn't matter. Even with warranty, this optical atrocity is unfortunately not worth much.