update: Thanks for all your replies 回复：回中国签证被代理机构宰

谢谢大家的回复.

我已拿到签证, 没有另外交费. 其间叫了警察,警察帮了我们.

经验和教训:

Always get anything on writing in advance.

Call the police if necessary to safeguard your rights.

Go to the travel agency to get a visa.

Thanks again for all your help!

Have a nice day, Everyone!