Need help guys, we notify management that the exterior wall and windows defect is common property defects, involving many units

So management suppose to be the one directly submit defect to developer (under DLP period) right? Since it is their responsibility to fix

Instead of this management only reply to say they will only try help owner push developer to fix what was submitted by owner, i.e. internal wall damage. While the real problem is rain water leaking from outside due to defect of exterior wall and windows

Can sifu advise what should be the next step?