There was another person here who had a similar experience:
https://bitcointalksearch.org/topic/fraud-warning-bitstamp-is-holding-my-money-hostage-and-ignoring-me-for-14-days-2079512His case was resolved in his favour.
If Bitstamp closed your account but are withholding your funds, then I suggest you be persistent and stubborn in your efforts to contact them. If you don't, the silent treatment might extend to weeks, months of even longer. Or even indefinitely. Proactive efforts on your part is a must if you want to achieve results. Read the above person's Bitstamp saga. He contacted their support staff, reached out on twitter and even Bitstamp's investment partner, Pantera Capital. They finally replied and apologised but this was a case of misidentification.
As for your case, if they closed your account, there must have been some kind of investigation. They only close accounts for a reason and I suggest you stubbornly try to contact them to get the answers you need.
Sending your entire life savings to an exchange without carefully thinking about the risks was a foolish thing to do. Now they have your money and coins and the silent treatment begins. If those coins were legally acquired and if the fiat you deposited was clean money, be persistent (well, I would if they had my entire money).