Cracks detected in basement concrete exterior wall, how to proceed?

Regarding 1) Be careful with pictures through the construction fence. The general contractor could escalate further with a privacy screen. Only send pictures if it is absolutely unavoidable.
Regarding 3) You cannot take action against the notary. Strictly speaking, he did not advise you incorrectly. Save your nerves.
Regarding 6) After defect rectification, the trade is free of defects and you must pay the full rate.

Let's keep things in perspective. The [GU] is sensitized.

Do you want to withhold money for the resolved defect?

Thanks to all of you for your good contributions!

The wall was
1. chipped off at the affected spots with cracks
2. newly shuttered
and then
3. grouted with the ceiling.

GU never reported anything regarding this.
It only started through the construction controller.

Thank you for the feedback.