I am at a loss for words due to sheer stupidity to give you any meaningful advice here except that your house construction contract most likely contains the penalty for not accepting the house.
Hi, I once described your case to a lawyer friend who also says to talk to the company, often you get off with just a scratch and if not then hire a publicly appointed expert who can make the company bleed significantly to your advantage.
Thank you for the response With the insults I can manage I now have an appointment with the specialist lawyer. I will have the statements that the company is just meeting the standard checked by other experts as well. The company is basically still in the running. I just don't like that I am in a poor negotiating position.