Same Language, Different Culture

I’m feeling extremely frustrated about my immigration status. I haven’t written anything about this for a while because absolutely nothing has changed. I still need proof of lodging and I still don’t have it. My letting agent agreed to send it about three weeks ago. I just assumed that he would. I feel like I’m sitting around with my thumb up my ass, waiting on people who couldn’t care less whether I can come back or not.

I called last night, leaving a polite message, asking them to ship me (another) letter via express mail. Well, I assume it was polite. Due to the time difference, I’m never going to get to speak to a live human. I don’t know how to leave a message which will communicate my urgency. Should I yell and be angry? Should I throw myself at their mercy? Should I just wait a few more days and avoid calling?
They didn’t email me back, which has left me extremely frustrated. I think I will go to my academic supervisor for help. He’s (anglophone) Canadian, though, so if yelling and abuse is called for, he’s not a good go-to guy.
I don’t want to drop out of school because my letting agent can’t be bothered to send me a vital document. But my school can’t be bothered either. If the two entities which derive an income from my presence don’t give a fuck, why should I? Put me in detention, be all transphobic, send me home, don’t give me any documents I need – I’m starting to feel somewhat unwelcome.