ᐅ Main structure of the multi-utility connection installed too deep

Hello,
our utility shaft was cast too deep. Now it is no longer watertight. Since all the service lines have already been installed, the manufacturer says it is no longer possible to seal it.
As the invoice for our shell builder is still outstanding, I am wondering what the best way to proceed is.
The defect was also not noticed by the site management.

Do you have any suggestions?

First, report the defect, right? Then a plan is needed to address the defect (if it actually exists). What is the contractual arrangement?

I reported the defect to our architect/project manager in August and to the structural builder last week. I took photos when I was made aware of the defect by the utility company during the installation of the first service line back in August. I purchased a compensating frame through the architect and assumed the issue was resolved. When I recently tried to pass the costs on to the structural builder, they questioned how this could be. Only then did I realize that the meter cabinet was embedded too deep in concrete, which is the reason for the needed adjustment.
Contractually, the architect prepared a bill of quantities, and the structural builder completed the work accordingly.

I expect that the structural builder will acknowledge the defect (currently awaiting their response).
For now, I am primarily interested in how this defect can be fixed in a technically and economically reasonable way that suits all parties involved.

Manufacturer’s statement:
"...if the utilities are already installed, unfortunately there is no possibility for subsequent sealing.
That is why we offer our complete homeowner packages with both the structural component and the finished component (sealing), so that the utility lines can be sealed at the time of installation by the provider."

I can’t make sense of this. You identified a defect in August and reported it (immediately) to your architect, who is also in charge of site supervision. What was their response? What actions were taken afterwards?

The architect should be able to determine how the defect can be resolved, right? Responsibility for it can be determined later.

Our architect did not take care of this, and for me, the issue was initially resolved by ordering the leveling frames. Presumably, our architect will not handle it any further... but that is another matter. Otherwise, I wouldn’t be seeking help in this forum.

Currently, I basically have the problem that the contractors want their payment, but there are still discrepancies that only our architect can really clarify, as I lack the necessary knowledge and information.

So, I have no choice but to deal with it myself until I acquire the required knowledge or become so overwhelmed that I don’t care anymore and either pay or let it go to a legal dispute, which I actually do not want (and do not consider necessary).

Does anyone perhaps have a technical solution? For now, I am not concerned about responsibilities but rather the technical solution itself. Who then pays for or carries out the implementation is the next step.

1-2 pictures?