I have no idea what the expectation or culture is like down there, but to me, this seems like a scam to get some unpaid grunt-work done using the false lure of an internship.
If I were in your position, I'd be telling them that I was there to gain experience as a photographer, not as a bus-boy, maid or rent-a-cop; and if that wasn't going to change, then good-bye. I doubt they'll care anyway, they'll just lure in some other sucker.
If I where looking for some sort of internship, I'd gladly be a roadie and assistant for a photographer or lighting crew for no pay in exchange for a free learning experience. Internship goes both ways: the professional gets some free help with equipment hauling, setup and takedown in exchange for letting the intern follow him everywhere. The intern get some free learning and experience in exchange for some manual labour.
Seriously, find someone who won't treat you like expendable dirt, this is an insulting waste of time.