I have now written a letter that will be sent tomorrow by registered mail with return receipt. A deadline for remedying the defects I have listed is set until 31.10. We expect a response to our email from 20.9., in which we pointed out the streaks in the glass, by 11.10. with a proposal on how we could come to an agreement.
I will also discuss this tonight with our house builder, who is terribly embarrassed that we are having such trouble with the glazier he recommended. The intention was actually to reach an agreement that would satisfy both parties. Apparently, that no longer works.