Hello, I am here to seek advise..  Im staying in a new condo at lvl 15 and recently receive call from MO that they needed to hack my toilet wall due to lvl 11 having leakage. They said it is due to leaking is coming from shared pipe which is located at lvl 15. While I understand the pain of lvl 11 and have already given OK to the MO to hack my wall..

But, are they (developer) liable to compensate me for inconvenience (wall hack being major work) or there is nothing I can do about it except welcome them each time the units in lower lvls have leakage? 

Thank you!