The only advice I can give is:
- Call the College and demand to speak with someone that can help you. Tell them you need the updated LOA ASAP! Not much else to do, honestly.
- Delay your flight to December. Not only because you don't have the LOA but because it is highly advisable to arrive with no more than one month in advance prior to the start of classes. If you arrive earlier, chances are the VO might ask you additional questions. If you can't delay your flight, make sure you have a good reason to give to the officer about why you are traveling so early.
You should update in the forum in case future applicants can find your information useful. Good luck!