I think nothing you can do about it mate, I mean they clearly state that don't deposit any coin in any amount to their wallet. They not even completely cover the lost coin when it is clearly their fault, you think they'll bother to send back coin you accidentally send. And why at the first place you "accidentally" send your coin there?
Anyway sorry for your lost mate, and its a big amount of money in my opinion. So next time you want to move your coin/token to any other wallet beside yours you better double check the address.