Dispersion paint doesn't hold?!

Hello forum!

I would like to briefly describe our situation and find out if any of you have experienced this problem:

We are about to move in. Last weekend, we wanted to paint the skirting with latex paint (we don’t want baseboards). So, we got to work, taped it off with masking tape, applied the latex paint with a brush, and then immediately removed the masking tape again so that the latex layer wouldn’t be damaged when pulling the tape off.

And here is our problem: Although we removed the masking tape right away, the dispersion paint still sticks to the tape in some places, so it comes off and you can see the gypsum plaster underneath.

- The painting was done by a professional company (whom I fortunately haven’t paid yet).
- I had an expert report made by the plastering company and the supplier of the interior plaster material through their laboratory, and they claim that the substrate was dusty and therefore the paint does not adhere.
- But the painting company actually applied a primer (which apparently does not seem to have any effect).
- The paint not only comes off partially at the edges but also, for example, in the middle of the wall.

I don’t know what the standard is here, but I would basically assume that masking tape shouldn’t pull off the paint, right? Also, the painting company must ensure that the substrate is suitable, right? I find the whole thing pretty annoying since we deliberately had the painting done by a professional company that some people do themselves because it was important to us that this final step be done by professionals.

How do you see it, or has anyone possibly had the same problem?

Best regards Jochen

Pictures?

The original text is only the code , which is not to be translated. Therefore, the translation is:

What does the painter say?
That must not be. There are three possibilities:
1) Dust/dirt/grease/silicon
2) Too wet
3) Wrong paint
Karsten

I have not yet confronted the painter with it because I first want to receive the report/the assessment from the interior plaster manufacturer (I want to have something in hand before I start the discussion with him, as he will surely try to blame the plaster/substrate). The question for me is how a possible correction could look like. Sanding everything down would be a dusty matter (most of the furniture has already been assembled)…

You somehow look very thick,