My bank has been wiped twice at this point and downgraded from 90 to 60 slots both times. I guess I am lucky it wasn't as bad as your case. Obviously, any of these issues are totally unacceptable.
You're never going to get anything back...my buddy just lost 50,000+ gold and all their items in the bank a few days ago(they're craters) and they sent in support tickets and they were answered...days later...generically(Greetings Traveler, etc)...since they can no longer play the game they quit and canceled their sub, I told them to ask for a refund.
Posted this on a few thread so people know that customer support is garbage and will not help you at all.