Prubino, their contact number was displayed right after you've submitted the application. I don't think there is any chance to email them - without any email. So I suggest ring them up.
I have the same problem with this letter of comparibility! I studied in Melbourne and did the international baccalaureate which is supposed to be recognised across the world, except not at BA :-/
I submitted my app on August 26th and still waiting for a reply. However, dont know if I should bother about this comparibility letter now or when they get back to me.