My co worker linked his bank account via instant verification 4 days ago and then immediately made 3 tx which were all pending still today. When he went to log in it said his account was closed?
CONTACT THE SUPPORT AS SOON AS POSSIBLEYour friend probably has his account compromised by those assholes, they are capable of doing anything in order to steal as much as they can.
How much money did he deposited in there?
It is incredible how thiefs they are, that is why i have always been out of those exchanges and i am now holding all my bitcoins on an offline wallet, THAT is the only way to protect your bitcoins from those assholes.
He is going to get replied in a week, or maybe a month, but do not lose the hope.