email support, they will help you out. I've had problems occasionally (with much larger amounts of BTC) and they sorted it out. They aren't trying to steal 3 BTC.
I agree; I don't think they are trying to steal 3BTC. I think its incompetence rather than anything malicious.
I believe they are migrating their servers, so it may be due to that. If so a competent company should put measures in place to prevent this sort of thing occurring during a migration or upgrade.
I have emailed their help with no response for 14 hours now.
A successful company will scale itself appropriately to meet the growing demands of its users and business activities. However I get the feeling that MTGOX are trying to carry on as they did 3 years ago with the same set-up and this is clearly not working. I was initially very impressed with MTGOX but that has started to fade over the months: customers are in the dark about what's happening and I feel like this tiny organisation with small scale infrastructure is being crushed under the weight of the current user-base and carrying on with everyone there reassuring themselves it will all be fine.