There have been more than 300 confirmations but it has not been credited to my account.
Submitted support ticket and PMed their staff on Reddit. But has got no reply yet.
Anybody has the same problem?
Would you mind including a txid along with your claim?
25 ETH is indeed something to be worrying about. However as warningsigns said, bitstamp has been one of the longest running crypto exchanges without any major issues. It is also licensed, and regulated. There has been no hacks which means that if you deposited to the right address then you are definitely going to be receiving your coins, whether sooner or later.
I would consider keep opening new support tickets, until they resolve the issue. Sometimes the wait can be long.