I buy an Opel Astra in January 2020. The car drive...

I buy an Opel Astra in January 2020. The car drives super well however there is too much traffic noise in the car from the outside. This is the contact I am negotiating and they are asking me to come. On the phone, they say it's weird because they have a lot of these kinds of cars on the road and it's not something they've heard about before. When I come by car I suddenly have a story that it is a general mistake of the vintage of Opel so they can do nothing about it. They say that they have previously had a case through the FDM which said that nothing can be done about the problem.
I contact 5 different Opel workshops to find out if they have any experience with what to do and none of them know that it should be a general mistake they have never heard of. I also contact FDM to hear if they know anything. They do NOT.
I am encouraged to make a complaint and ask to have it made. To my complaint, respond to the motor company: the case is closed by the dealer.
Very poor service and only on sale.
The car is a vintage 2017 from October and has noise in the car measured at 100 decibels. That's about 30 decibels too much for that type and vintage. Of course, the case goes directly to FDM.