warped parquet spreading

Hello everyone,
our parquet was installed by the craftsman in the summer of 2019. In winter, the craftsman cleaned and oiled it again. It is a Berg&Berg parquet, which was oiled at the factory but according to a Berg & Berg representative a few days ago still needs to be oiled again after installation.
The craftsman removed adhesive residues, oiled it again, and worked on it with a machine (polished).
A few days later, we noticed some spots on the edges (20 cm wide planks, wear layer 4.5mm) that were "splintering." We immediately filed a written complaint requesting that the craftsman repair the spots.
In May 2020, we moved into the house and after every cleaning it got worse; more and more splinters and small holes appeared on the edges.

In the living room, it looks really bad, especially since there are large windows and apparently these spots become even more visible in the light.
In winter, the heating was set to only 15 degrees, and we always kept the humidity around 50%.

We then complained again by phone and asked the craftsman to come by.
At first, he said he had done first-class work and would definitely not come by. The phone conversation between my daughter and him then became somewhat harsher.
I would like to point out that I have known the craftsman and his employees for many years and they have always done top work for me. I could only explain this with a material defect and told him this again.

My daughter, the homeowner, wrote to him separately and gave him a four-week deadline to come by and look at the floor.
A few days later, suddenly a call came from a Berg & Berg representative, who visited us an hour later (he was just nearby).
He inspected the floor and confirmed that it was exactly as we described.

At first, he suspected an installation error, meaning that the edges were knocked too hard. But that could not be the case because it is always exactly the other edge that is damaged (the side that the craftsman only slides against the already installed board). We knew where the craftsman had started his work, so this possibility was ruled out.

He then suspected that the planks had suffered transport damage and that the edges were damaged. As soon as the edges get damp, they splinter more and more.
He agreed with us that after the heating period and after each cleaning more and more such spots become visible.
According to the representative, the planks could be repaired bit by bit. He said that this was a matter between the craftsman and Berg&Berg. The costs should be settled between them.

I have serious concerns about how the floor will look in a few years. The floor is a white-oiled oak floor and has some knots.
The repair is just putty—if it were only 10 or 20 spots over 200 sqm, but in the living room I really get queasy.

Who can advise me?

The manufacturer says the floor is defective. Do you have that in writing? Peu à peu repairing is nonsense.. it’s supposed to hold? But no matter, if he already says it will always continue like this, then the floor would have to be replaced. What does the seller or installer say after the appointment?

Allegedly, the craftsman will contact us. We have not received anything in writing from either the manufacturer's representative or the floor installer. The floor is glued down - so it is not something that can be quickly removed again.

We have now written to the floor installer, informed him of the content of the conversation with the representative, and asked him to document the damage and its repair in writing.

I probably cannot demand a replacement, as the craftsman always has the right to rectify.

According to the representative, it can also be repaired.

The only question is whether anyone has had something like this before and if it was properly repaired.

I probably cannot demand an exchange, as the craftsman always has the right to make repairs.

That is wrong. He does have the right to make repairs, yes. But how often is a different matter. I would address it exactly like that. The repair may be done. If it now visually stands out significantly, for example due to a different batch or otherwise, it will be complained about again and an exchange demanded. If further spots appear, which does not seem uncommon, it will not result in another repair, but a complete replacement. You do not have to endure the stress of moving all the furniture every time, taking time off work, and setting everything up again.

Will probably be repaired with wax. You had offered this to us. We had cracks in the wood. Well, we have been waiting for the repair since Nov 2018. We did it ourselves. I no longer want to have this ragtag crew in the house.

It will probably be repaired with wax. They had offered this to us. We had cracks in the wood.
Well, we have been waiting for the repair since November 2018. We did it ourselves. I don't want this ragtag crew in the house anymore.

Yes, that's what I fear too. But the floor cost us 22,000 € - so that's where the fun ends. If it were just a few spots....