Right action against nuisance cause by noisy neighbours

Hi,

It's been 3 months that I moved to this apartment. But the neighbours are noisy that I feel the ceiling will collapse.

I complained to the security, to the real estate agency and I even called the police. Nothing changed!

I asked the agency to change the flat for me or to fine the neighbours; they completely stopped replying to my calls or emails.

What can I do?

Please, I’m desperate.