Which Portuguese Classes provide Student Visa? (São Paulo)

Hi there!

I have been working in partner-agency's office now (AD/Promotion field),
trying to establishing my Korean agency's branch here.

so, this partner agency is supposed to solve my administrative issue such as VISA. But as you may imagine, they seem too slow to finish the process until my tourist visa expires.

This is actually my second time for this kind of short-term staying.
I stayed here from SEP - DEC Protected content , and came back in MAR Protected content
so technically, I have only about 2 months to stay here legally.

Now I am considering to have student VISA by enrolling the Portuguese class just in case they miss my deadline. I should learn the language anyways.

So any idea who provides student VISA for their part-time students?