Liquid Damage

My 11 Pro Max was officially repaired by Apple due to a fault with the camera after only one month. A few months later the phone was splashed of water which stopped the phone ringer and the face recognition, all other features still function. Apple service center checked the phone and confirmed liquid damage which is not covered under the warranty. My claim is that the phone was not waterproofed correctly after repair but as there is water damage they will not listen. Can anyone help with advise.