Issue with one of the buttons on 4-gang Switch

Hey guys,

One of my buttons is no longer functioning, it won’t physically switch the relay meaning it stays permanently on no matter if the button is on or off (it also makes a mellow thud as opposed to a loud distinct click like my other switches/buttons) – anyone know what I can do to fix this? LIFX won’t help as I purchased it via eBay.

To add to this, I can’t even remove the faceplate as the clip was stuck and now broken off …