Did you speak to their admissions committee? Try to tell them that you will cope up with the lost lectures in no time. If they can't do anything, then you might have to return back to your country as you can't work till your college starts and staying there without job will make a big hole in your pocket unless you are rich and your parents are willing to pay for your expenses. Also, if you think of coming back, you might also need to update the visa office about the deferral so as to extend your permit.
