There is something wrong with my friend's visa. His boss gave him a tourist visa, but he works in Indonesia. Now his passport has been detained by immigration. What should I do?

If it is because of the passport itself, maybe the consulate will help.

If you have your own problems, such as unreasonable visa, expired visa, or something illegal, it is estimated that the consulate is unlikely to help you and you need to solve it yourself.

Ambassadors and consulates abroad are not public welfare units, so don't expect too much from them. People abroad should know. For China people, they are just a place for stamping and signing formalities.