Salt damp and damaged carpet

Three years ago my carpet in my dining room and hall way were getting wet. The strata plumber can out and said it wasn’t the breacher (the only thing strata covers), that it was either the water proof matting, or lack there of, or it was the grouting. He said the was no way to tell, just try one and hope for the best.
My breacher in my bath had gone so it was replaced.
A few months later as I was saving up to get the grouting done the pressure still felt off so I got the strata plumber back. This time he decided the breacher had gone and it was replaced.

The carpet was stained but staying dry I let it go but the other month I notice bubbling on the dining room wall down low. I touched it and my finger went straight through. I then touched the carpet and it’s wet again.
The pressure feels fine. I think maybe it’s the grouting, or water proofing.

The door frame is also wet and rotting at the bottom in the bathroom.

Questions are-
Am it responsible for the salt damp and am I responsible for the carpet?
If strata is responsible for the carpet, do they just replace a small section?
What is they can’t get a match? the carpet is very old.
They told me when they fixed the breacher that they didn’t have to replace the tiles with like tiles. That they tiles as similar as they could, but if they didn’t match, to bad.

Also is it true that strata only covers breachers in the bathroom and nothing else?
We have no specific by laws in regards to this.
I live in SA and our units were built in the 80’s. There are 6 single storey units.
We obviously have building insurance and I have contents insurance.