Can Cameroonian Embassy in Beijing help me to get out of China?

I am a Cameroonian living in China.I lost my passport 3 years ago and two years later, i tried to go home but the immigration in Guangzhou and Foshan where i went to told me that they cannot help me. I don't know if the embassy can help me in anyway to leave this country or if anybody has an idea how to leave here without a one month detention but pay my fine, i would highly appreciate it. thanks