How can the property send a letter to the construction party if it does not cooperate with the maintenance project during the warranty period?

Contact the construction unit first to inform the contractor that it will not perform the warranty, and then send a letter to the contractor. The content is very simple, that is, dozens of words: according to the quality guarantee of commercial housing, how long is the project warranty period? Our company requires your company to fulfill its warranty obligations. Please send someone to our company for consultation and rectify the maintenance plan within a few days. If the time limit is exceeded, our company will contact other maintenance units to carry out engineering rectification, and deduct relevant expenses from your warranty fund. Ask the construction unit for the contact address and telephone number of the other party, then send a letter to the postal service and EMS, indicate the rectification contact letter of what item on the mailing list, then keep the receipt and save the circulation information of the mailing list number on the Internet, and it will be OK.