Demolition and reconstruction of the exterior wall due to defects

Attached are a few pictures. The issue of overlap dimensions and the not fully mortared bearing joint can be seen

What you are showing is so concerning that demolition and rebuilding of the wall seem inevitable. Incorrect overlapping length and too little mortar are structurally significant. You don't want to live in a structurally unstable house. Whether the concrete ceiling above can only be saved by demolition and rebuilding I cannot assess. An expert will provide you with clarity. I sincerely hope your masons do not stubbornly oppose. Good luck!

Whether the concrete ceiling above can only be saved by demolition and rebuilding I cannot judge. An expert will bring you clarity. I really hope that your bricklayers don’t stubbornly oppose.

In my opinion, one really has to use the intensified Bavarian negation here: no bricklayers are that, never not. I also rather don’t think that anyone holds a floor slab on supports and in the air at the crane until new walls underneath have been built again ;-) But I don’t expect a flawless ceiling here anyway. My general doubts about the contractor’s expertise persist. Is this a mailbox general contractor who, project by project, loads his pickup with temporary workers from the “worker street” – of course with their own business licenses? (I didn’t give the reading tip to the thread by without reason).

An expert has now been involved. He also says that normal material here does not help. At most, ribbed steel or brick rabbit wire. But these are things used rather in old buildings than in new construction. I am getting desperate.
The way the construction company is behaving, there certainly won't be a simple teardown here. And these are not all the defects. Concrete basement with gravel nests, drainage not according to DIN... oh dear oh dear. We have initially withheld the last two partial payments. We hope to be able to sue for our rights....
The construction company is one from the region....
Hampshire and 11ant, are you also experts or where do you get your expertise from?

No, not an expert, I haven't properly trained and am a universal dilettante. ;)

Better a universal dilettante than a specialist idiot, as my late godfather always said.

hmm Autocorrect wanted to change specialist idiot to fascist. hehe...