Oh boi 1200BTC, I would really advice anyone not to store/deposit such large amount in one exchange even if you're fully verified. I've read lots of thread about frozen funds and I can really say that ppl who transacted with huge amounts of money are more inclined to get flagged as they are more noticeable.

I don't know if it'll work but its worth the try to link your forum threads when you contact them because public image is really important for companies, it could make them feel alarmed. I hope you can get your money soon!