This is ridiculous! How can you entrust such a huge amount of money to a third party exchange which can not be trusted,. They can not be trusted as there has been complaints from members about their activities and how they were treated. This exchange does not have any good record to compliment their existence, neither do they have conscience.
You don't have the first clue what you're talking about. Bitstamp is one of the oldest and most trusted Bitcoin exchanges around. Please don't comment in threads if you know nothing about the service being discussed.
As far as OP's complaint is concerned, there really isn't much we can do besides try to help them figure out how to get an answer from Bitstamp.
First of all, do you have any kind of screenshots that prove you made a deposit to Bitstamp? You can blur out all personal details and addresses, but as of now you haven't really provided any kind of evidence that you made a deposit at all.