Peter Smithson wrote

Thing is, the direction of the bend can't be explained by the bricks.

They still stuffed up and needed to ensure that
the frame was installed so that it was true.

Imagine my wall runs east to west. If a brick was sticking
out, you'd expect a bend in the east or west direction.
But the bend is in the north/south direction.

Yep, they stuffed up.

Their explanation makes no sense to me.

Yep, they can't even bull**** their way out of their predicament.

Tell them they wont get paid until they fix it.