I purchased a Ninz door, because I needed a door w...

I purchased a Ninz door, because I needed a door with soundproofing power for a plasterboard wall.
However, the model was not the right one.
I went 3 times to Ninz with the headquarters in Bolzano to ask for information and I called Ala several times.
Nobody was able to give me concrete answers, indeed you almost have to be scolded behind writing an email to get answers.
I have written multiple emails, months have passed, and have not yet been replied.

How do you get employees in a company who can't even give you basic information?

Zero professionalism.