Ğlad you feel better ������
Let it out…
The concrete company sent a notice to owner, presumably the contractors client of record and your customer for the construction draw…?
Have your customer call the concrete supplier and demand that because the forms and work are not as designed, according to your professional observations, they will not be paying the the bill. No doubt the builder has a substantial amount coming following a pour. Should get his attention. Suppliers are not inclined to give you something where they won’t be paid.