Thank you very much for the numerous responses. As expected, I will have no leverage there.
Simply annoying: the original (WERK) planning did call for a soffit cladding on the slope. Then, in good faith and full trust in the skilled trade (or full of NAIVITÄT), one lets oneself be persuaded by the carpenter over the phone to install it level, and now one has to pay 3000 EUR for the correction, although now even the company thinks it looks unusual.
In old age, I will probably also fall victim to the grandson scam;o(
Well, then we'll consider whether we want to tolerate the appearance for a few years until the first renovation/painting or correct it right away.
Have a nice day