Shower drain too high, water does not drain, silicone is peeling off

Hello. The shower drain in our new building was installed 2 to 3 mm too high. As a result, the water does not drain correctly. I think that 300 ml always remains in front of it. The water then stands in front of the edge and therefore touches the silicone on the side. Because of this, the silicone (at the transition between the wall and floor tile) peels off at that spot, I think (it is anthracite silicone and becomes lighter at that spot). It is directly above the tile joint.

I got the following drain:
VILSTEIN shower drain 70cm, stainless steel floor drain complete set, extra flat, siphon with odor trap, hair strainer - tileable

Can I simply sand the drain a bit (possibly completely or just create a small groove)? With stainless steel, that should be possible, right?

Turning to the tiler is unfortunately not an option, as I have no receipt.. Next time it will be different!

Upload a picture of it.......

In the 2nd picture, you can see that the front joint is slightly raised. The lower right joint is affected regarding the silicone. We have already completely replaced it on the side once. We have been living in the house for 4 months.

Hi,
Theoretically, you could try sanding it down, but there is a risk that the treated spot will start to rust (not the stainless steel but the particles from the grinder that get embedded in it). Also, a sharp edge can form. Finally, it could happen that the joint or tile gets damaged, which 1. looks unsightly and 2. can lead to leaks.
The only proper solution would be to remove the mentioned tiles that sit too deep and reinstall them correctly.

Anything else will not bring you joy in the long run.

Best regards

Contacting the tiler is unfortunately not possible since I have no receipt.. Next time it will be different!

Complaints are initially not a matter of a receipt, but of communication and decency. You can't enforce anything. You can talk.

As long as the grout is sealed, you don't really have a problem. After showering, just use a squeegee briefly and that's it.

In principle, a small incision is sufficient for the flow of the remaining water, right where the water stands at the "lowest" point in the channel? The risk of damage is lower there – especially since you could almost "grind" it micro-surgically and see if it helps?