When buying a building, if the elevator doesn't open, find that department to solve it.

Complain to the property department of the housing management department.

If within the warranty period stipulated by the state, the development and construction unit shall be responsible for property maintenance. After the warranty period expires, the property owner (owner) is responsible for the repair and maintenance of the proprietary part.

If it is the elevator itself, you can complain to the local elevator supervision department, such as the quality supervision department and the safety supervision department. No matter which department you choose to complain, you need to provide a detailed description of the elevator problem and relevant evidence so that the relevant departments can handle the complaint in time.