Dayun Express didn't arrive until three days later. What should I do?

If it is in the province, it will take no more than 72 hours from scanning data collection to receipt. If it exceeds 72 hours, it will be regarded as a delay, and you can refuse to pay the freight for this express delivery. If you have paid the seller's freight for shopping on Taobao, you can ask the seller to apply for a refund of the freight.

If it is an inter-provincial document, what we can do now is to wait patiently. The logistics data shows that "Jiangsu Suzhou Distribution Center is about to be sent to Lianyungang", which may be due to some special reasons such as manpower or weather, such as waiting for shifts or coordinating transportation capacity, or already on the way to Lianyungang, just because the scanning data is lagging behind. Once the express mail is sent to the courier company, no one can control its speed, and neither the seller nor the courier company at the receiving and dispatching place can do anything. Regardless of the transfer process, inter-provincial parcels are received within 7 days in principle. If it exceeds 7 days, you can refuse to pay the freight for this express delivery. If necessary, you can complain to the website of the State Post Bureau.