Sinead

We live above a 3 bed flat that currently has students living in. Since they moved in we have had issues with hearing each of their firedoors shutting. I contacted their letting agents who came out and adjusted the fire doors to make them close softer. However, this has not helped and the noise is still persistent. I have fed this back to the letting agents however they have stated there's nothing else they can do, the doors need to shut to meet regulations. Is there anything else I can suggest to the letting agents to prevent or decrease this noise? I've looked at hush pads on Amazon but fear that they would say this would not meet fire regs? Any help would be greatly appreciated, thanks.