C
Concrete guy
It's not great to be honest, but it's serviceable and fit for purpose.
Whilst it could look better, legally there's probably not a great deal you can do about it. As all the law will look at is if the install has been done and is fit for purpose.
It's unfortunate that a contrasting grout has been chosen as this highlights the problem further.
If it bothers you that much I'd be inclined to fit a small cove or similar to the ceiling to disguise the problem.
Whilst it could look better, legally there's probably not a great deal you can do about it. As all the law will look at is if the install has been done and is fit for purpose.
It's unfortunate that a contrasting grout has been chosen as this highlights the problem further.
If it bothers you that much I'd be inclined to fit a small cove or similar to the ceiling to disguise the problem.