How to fix when water is not sinking from bathroom and balcony?
they will cut the walls and the floors to go to the joint and will find something

Try to find plumbers that don't tear down half the building to find they now see the outside of pipes, while the problem is in the inside ;-)
Instead find a plumber with a device that, as you described, can suck water out of the pipes first, then uses another device to go in the pipes and clean whatever is there.
It shouldn't be hard to find one with a camera device that can look at what is going on inside.
Btw. putting acid or any kind of cleaner into a pipe where the cleaner would have to go through a lot of water until it reaches the clog doesn't make sense.
You will end up with a pipe still full of water and the dangerous cleaner on top. That means you don't suck only water out of the pipe but also stuff that shouldn't get in contact with you.