Very messy parquet laying work - Is rework not possible?

(...) Good that there are enough craftsmen and service providers who know exactly what customer satisfaction and professionalism are.

You should basically be clear about one thing. If you ask a craftsman (or service provider, or anyone else) about another craftsman in the same industry, you will rarely or never hear "Oh, that one. Yes, he always works very conscientiously, much better than we do." It is part of the game to gossip as much as possible about the competitor on the construction site. And honestly. Whoever doesn't rot away in the public service or as a civil servant in one position, but has to perform daily to keep the job. Why should that person warmly recommend their competition? I am convinced that we do it better than our direct competition... that's why I work for my employer and not elsewhere... So with 3 offers you took the "middle" one, not the second most expensive. Why not the most expensive one? After all, you expected premium, right? If I want premium, I buy a BMW, not a VW. That, of course, costs more. And then, as a layman, you can't even distinguish between silicone, acrylic, and filler material, but you want to sue a professional because you don't like his work. The lawyer who takes this case will definitely get money. But from you... not from the parquet layer...

Anyone who is not rotting away in public service or as a civil servant in a position

The repair appointment was partially successful. The ugly little strips on the window were removed, and due to the crooked joints, there was a discount.

Everyone take a deep breath :)

That sounds like you have found a somewhat satisfactory solution.