The issue has been resolved and I received the right amount of BTC. A concrete reason of why it took so long has not been given.
It's good to see this eventually resolved.
How long did it take to receive the funds from the time you submitted the withdrawal?
There is still nothing on the withdrawal form saying that more than 1 BTC takes longer to withdraw.
Is it 1 BTC per day or 1 BTC per withdrawal? ( maybe 1 BTC per month, who knows? )