Sue to whom? There is no EU court you could directly sue to.
> Regulations are legal acts that apply automatically and uniformly to all EU countries as soon as they enter into force, without needing to be transposed into national law. They are binding in their entirety on all EU countries.
And:
> Public authorities in EU Member States have the main responsibility for the application of EU law.
"any person or company who has had their interests harmed as a result of the action or inaction of the EU or its staff can take action against them through the Court"