When are the old records of property complaints usually destroyed?

According to the system established by the company, under normal circumstances, important information is permanently preserved, such as building files, owner files, important contracts, etc. Some materials are kept for 5 years, 3 years and 2 years. According to the importance of documents, general complaint records are kept for 2 years. If there are important complaints in the middle, they should be listed to extend the storage time.