How to reply to the owner's complaint that express delivery is piling up like a mountain?

Owners complain that express delivery is piling up into mountains and should promise to strengthen management, further reflect to the urban management department of the jurisdiction and strengthen on-site law enforcement. Basic skills: don't avoid or reject the complaints of business owners, smile, look straight into the eyes of business owners, keep calm and listen silently, let business owners vent their emotions, don't interrupt the statements of business owners, listen carefully, don't miss details, summarize the core of complaints, and don't discuss or argue.