How to communicate with government departments when doing business?

That's easy to handle. Since you are the agent there, you must know the people there. First, get to know your friends' friends through your friends network, because there are probably people who work in or know the government, screen out people who can get in touch with government officials, and then mix with these people through some means. A place that is not a 1-2-3 line city, those officials can easily contact them. Because a local economy is underdeveloped, officials have different ideological desires and contact levels with people, such as the Food Supervision Bureau and the Industrial and Commercial Bureau. As you said, in some small cities, as long as they have a little relationship with local people, you will find that these government officials are actually very lonely, and you can bring them new income and entertainment.