check if any internal consealled water pipes, check if the wall near toilet, it could be toilet fr upper floor, check upper floor what they put up there, building a mini fish pond or what. you never know.

i have seen ppl use thier balcony and use it as a fish pond! The pressure of water forced the water to the floor concrete.

This is malaysia la. We live on tree. If someone pee on you below that is your problem. Sue them cost thousands and repair costs hundreds. Be logical or emotioal. Now this is emotional...I have a condo and the unit about the bathroom leaking to my bathroom and I have a monkey living up there. Calling him you get scolding and shout none of his shit, and said it was the developer who did not built it properly and hang off. You see I got a monkey that speaks, can talk one. and this monkey dont pay maintenance fee! He dont even allow me/management to repair it free for him! So have to wait and hope that he die soon!!!

For water pipe it might be easy to talk. Tell them that they are wasting water and eventually the wall will weaken and collapse. There is no way to escape, must repair. Best is to get the management maintenance to be involved. Instead of you get them to contact him. By the way, do you pay maintenance fee? 50% dont pay in medium cost apartment. 80% in high cost. Low cost none pay. If you dont, forget about it, the management is not going to help you.

Since they just renovated and still able to contact the contractor, the contractor should be responsible to them(and you) and fix it for free for job not done properly.

When it get serious it has to be the main pipe. For other pipes or drain hole when you dont use it it will not continue to leak. The main pipe with its high pressure cause it to get worse and worse.

When it is from the wall of the upper unit the water mark on their wall should show. If it is floor then it has to be the drain hole or when they wash and flood their floor, otherwise it has to be fr bathroom.

Poor thing,

It could be you pipe but wonder why would anyone connect pipe from top into the unit?

To check if the leak if from main pipe is easy. Turn off all tap and make sure no one flush the toilet. Go to the meter see if the meter run. Watch over 5 minutes or so. Take a puff if you smoke.

There is a possiblity it comes from bathroom. In the bathroom you cannot see water mark on the bathroom wall because it is tiled but you can see on the other side of the wall and if the other side is outside then sooner or later fungus will grow. It could also be the bathroom floor tiled not properly waterproof and is very common but should show water mark on your ceiling toillet if not the nearby room ceiling, not ceiling far away from the bathroom. This is because the bathroom floor are waterproof and the water cannot come down directly to your ceiling toilet and flow to the nearby room ceiling that is not waterproof.

Aiya, get a good plumber la, contractor cannot pakai one! only know how to make money out of people misery. Plumber is the one who do the job, rectify problem, contractor is the one who talk other do job and another pay and he counts money. A good plumber with experience can tell as they see these things so often and this is their rice bowl.

From what is describe it could not be main supply pipe. It is one of the broken drain hole pipe.

Go up there and pour a bucket of water to one drain hole and go down wait for 1 to 2 hrs. then try another. You can identify which hole.