Help! Extending M visa in China

Hello. I am new here and this is my first comment/topic.

I am making an internship in a hotel, Anji county, Huzhou province and i am holding M type visa which is single entry 90 days visa which expires on 16th of april, therefore I want to extend this visa for another 3 months (if i can choose - i would prefer 6 months). The thing is that China do not provide specific visas for internships, so i am in the hotel as a business partner. But my hotel asked officials about extending visa, and they answered that they cannot extend it because they consider internship as a job. . So now i am confused, i really love China, Anji, my hotel and people here are so friendly, i would love to learn Chinese language... but so far i see that i will have to leave just after 3 months.

i have just one idea, how i did it in Lithuania, where i applied for Chinese visa, i had to say that i am coming to hotel as a business partner and will not get any salary (formally i am not getting any salary, just reimbursement, which is legal to get and not considered as salary), and then they gave me visa, because before that i was in the embassy and i said that i am going for an internship, so they said that there is no visa for internships... so maybe i should do the same here in China?

Can anyone help?